Organosilicone polymers

ABSTRACT

ORGANOSILICONE POLYMERS ARE PROVIDED CONTAINING MONOMERIC UNITS A, B AND C WHERE A IS SIO4/2, B IS A POLYFUNCTIONA; SILOXY UNIT IN WHICH SILICON IS BONDED TO AT LEAST ONE ORGANIC MOIETY BEARINGS A POLY(OXYLALKYLENE) CHAIN, AND C IS A MONOFUNCTIONAL TROIOGANOSILOXY UNIT, AND IN WHICH THERE ARE FROM ABOUT 0.4 TO ABOUT 2 MOLES OF A, AND FROM ABOUT 0.2 TO ABOUT 2 MOLES OF C, PER MOLE OF B. THE POLYMERS ARE USEFUL AS SURFACTANTS AND FIND PARTICULAR APPLICATION IN THE MANUFACTURE OF FLEXIBLE POLYESTER URETHANE CELLULAR PRODUCTS, INCLUDING FLAME-RETARDED FOAMS.

United States Patent O ABSTRACT OF THE DISCLOSURE Organosilicone polymers are provided containing mon- V omeric units A, B and C where A is SiO is a polyfunctional siloxy unit in which silicon is bonded to at least one organic moiety bearing a poly(oxyalkylene) chain,

and C is a monofunctional triorganosiloxy unit, and in p which there are from about 0.4 to about 2 moles 'of A,

and from about 0.2 to about 2 moles of C, per mole of B. The polymers are useful as surfactants and find particular application in the manufacture of flexible polyester urethane cellular products, including flame-retarded foams.

BACKGROUND OF THE INVENTION The present invention relates to novel organosilicone polymers, and their use in the manufacture of urethane cellular products, particularly flexible polyester urethane foams including flame-retarded foams.

It is well known that the urethane linkages of urethane foams are formed by the exothermic reaction of a polyfunctional isocyanate and a polyfunctional active hydrogen-containingcompound in the presence of a catalyst, and that the cellular structure of the foam is provided by gas evolution and expansion during the urethane-forming reaction. In accordance with the one-shot process which is the most widely used industrial technique, direct reaction is effected between all of the raw materials which include the polyisocyanate, theactive hydrogen-containing com pound, the catalyst system, ,blowing agentand surfactant. A major function of the surfactant is to stabilize the ureuniform cell structure were attributable, at least in part, to the organic surfactants employed. However the mere substitution of the organic surfactants with various polysiloxane-polyoxyalkylene block copolymers which had been used as foam stabilizers with satisfactory results in the production of other types of urethane foams (e.g., in the production of polyether urethane foams and certain rigid polyester urethane foams), did not produce completely satisfactory flexible polyester foams. A significant development in polyester foam manufacture was the discovery that a satisfactory combination of uniformcell structure and freedom from splits was achieved by using a particular combination of foamstabilizing ingredients. This latter combination comprises (a) an anionic organic surfactant that is-soluble in thepolyester -polyol reactant at room temperature and that is capable of lowering the surface tension of the polyester resin reactant when dissolved therein and (b). a ,polysiloxane-polyoxyalkylene block copolymer surfactant characterized by a particular molecular weight (from 600 to 17,000), siloxane content (from 14 to 40 weight percent based on the weight of the copolymer) and oxyethylene content (at least 75 weight thane foam, that is, prevent collapse of the foam until Although certain techniques of urethane manufacture such as the one-shot process and certain components of the foam formulation such as the polyisocyanates, amine catalyst and blowing agent, are generally useful, a specific problem associated with the production of a particular type of urethane foam and the solution thereto are often peculiar to the particular chemical and physical structure of the desired foamed product. Thus, a significant development in the production of a polyether foam or a rigid foam, for example, may not be generally applicable to the production of other cellular products. In particular, the efficacy of the foam stabilizer is usually selective with respect to the formation of a particular type of foam. For example, although flexible polyester foam was originally made .using conventional organic surfactantsor emulsi- -flers, such compounds were not effective for the manufacture of flexible polyether foam. As urethane technology advanced and end-uses became more varied, it became apparent that certain deficiencies 'in the quality of flexible polyester foam such as the presence of splits and anonpercent based on the total amount of oxyalkylene groups in the copolymer). This particular advance in polyester foam manufacture is described in greater detail in Belgian Pat. No. 724,951 corresponding to US. application Ser. No. 688,702, filed Dec. 7, 1967, by Lawrence Marlin, now US. Pat. No. 3,594,334.

Another class of organosilicone polymers known to the art are those composed of the following two types of silicon-containing units: (1) inorganic tetrafunctional units in which the four valences of silicon are bonded to oxygen (Slo and (2) the monofunctional trimethylsiloxy units, (CH,) SiO Polymers of this type in which the SiO :(CH SiO mole ratio is from 0.8:1 to 2.0:1 are described in Belgian Pat. No. 720,212 as effective stabilizers of flexible polyether urethane foams. On the other hand, copolymers composed of the aforesaid SiO and (CH SiO units are ineffective stabilizers of flexible polyester foam.

Also reported in the prior art (US. Pat. No. 3,511,788) are polymers containing the aforesaid inorganic tetrafunc- 'tional units in combination with (CH SiO units either as the 'sole type of monofunctional unit or in further combination with a second type of monofunctional unit in wihch the silicon atom is bonded to two methyl groups and a hydroxyl-terminated poly(oxyalkylene) chain which is linked to the silicon atom by a divalent trimethylene group. In the polymers'of US. Pat. 3,511,788, the proportion of tetrato total mono-functional units ranges from 1:06 to 1121.2. Although the polymers of the aforesaid patent are reported therein as useful frothing agents in the manufacture of polyvinyl chloride plastisol foams and foaming agents for simple organic solvents, they are ineffective stabilizers of flexible polyester foam.

An additional factor which further complicates this area of technologly is the need to minimize and ultimately overcome the major drawback of urethane foams in their ability ;to ignite readily and to burn. In view of the fact that urethane foams are used in applications where fire creates a hazard, a great deal of effort has been and is being expended to impart and improve their flameretardant properties. Here too, however, specific types of foams have selective requirements. Flame-retardancy is particularlydifficult in the area of flexible foam manufacture in view of the delicate open-cell nature of flexible foams as compared with the closed-cell and highly crosslinked rigid foams. The problem is compounded by the desirability of achieving fire-retardant properties without any substantial sacrifice of foam quality required for a particular end-use application.

It is an object of this' invention to provide new and useful organosilicone" polymers'wh'ich "have""particular" application in the manufacture of cellular polyurethanes.

Another obiect is to provide new and improved organosilicone polymers which as'such" are potent stabilizers of flexible polyester urethane foam including flame-retarded foam. Another object is to provide organosilicone polymers having the aforesaid characteristics,'in-a form which'reaccompanying description and disclosure.

SUMMARY on THE INVENTION,

In accordance with the teachings of this invention, organosilicone polymers are provided which comprise: (A) inorganic, tetrafunctional silicon-containing units in which the four valences of therespective silicon atoms are; satisfied. by bonds to oxygen, (B) polyfunctional siloxy units in which silicon is bonded toat least one organic moiety bearing a poly(oxyalkylene) chain, and (C) monofunctional triorganosiloxy units, and in which the mole ratio of said tetrafunctional to said polyfunctional units is from about 0.4:1 to about 2:1 and the mole ratio of said monofunctional to said polyfunctional units is from about 0.2:1 to about 2:1.

For convenience, the aforesaid monomeric units of the polymers of this invention are referred to herein generally as the .A, B and C units, respectively.

In addition to the aforesaid novel class of organosilicone polymers, the present invention also provides a process for producing a flexible polyurethane foam" which comprises reacting and foaming a reaction mixture'of:

(I) a polyester polyol containing an average of at least cyanate, taken together, being present in the mixture in a major amount and said polyester polyol and polyisocyanate being present in the mixture in the relative amounts required to produce the polyurethane foam; (III) a blowing agent in a minor amount sufficient to foam the mixture; (IV) a catalytic amount of a catalyst for the reaction of the polyester polyol and the polyisocyanate'to produce the polyurethane; and I (V) a foam stabilizing amount of the organosilicone polymers of this invention comprising the aforesaid tetrafunctional, organo substituted polyfunctional .[and

monofunctional silicon-containing units A, B andHC.

The organosilicone polymers of this invention can be introduced to the urethane foam-producing'reaction mixture either as such, as a blend with various organic additives, or as a component of an aqueous premixture which also comprises the catalyst for the polyester polyol/polyisocyanate reaction. i 1

In addition to their effectiveness for stabilization of flexible polyester. foam, the organosilicone polymers of DESCRIPTION OF THE PREFERRED "EMBODIMENTS The functionality of therespective types of structural units (A, B and C) of the polymers of this invention defines the number of oxygen atoms to which the silicon atom (Si) of any particular unit is bonded. Since each voxygen atom is shared by a silicon atom (Si) of another unit, functionality also denotes the number of linkages by which the particular unit can be bonded to another portion of the polymer through Si'OSi'- bonds. Accordingly, in expressing the structural and empirical "formulas of the respective units of the polymers of this invention, fractional subscripts are used in which the value of the numerator defines functionality (i.e., the number of oxygen atoms associated with the silicon atom of the particular unit), and the denominator, which in each instance is 2, denotes that each oxygen atom is shared with another silicon atom. t

Thus, in the inorganictetrafunctional units (A) of. the polymers of this invention, each of the four valences of silicon is associated with oxygen as shown by the structure.

and expressed by the empirical formula, SiO which in abbreviated form is often expressed simply as SiO In the organo-substituted polyfunctional structural units (B) of the polymers of this invention, from two to three valences of the tetravalent silicon atom are associated with oxygen and at least one valence is satisfied by a bond to a carbon atom of an organic moiety bearing a poly- (oxyalkylene) chain. For the sake of brevity, the said poly(oxyalkylene) chain-bearing organic moiety is also referred to herein as the polyether group and is designated herein by the symbol B. When the B unit is difunctional, the remaining valence of silicon is satisfied by a bond to a carbon atom of either a second polyether group (E) or a monovalent hydrocarbon radical, designated herein by the symbol R. Consistent with this definition, the polyfunctional siloxy units (B) of the polymers of this invention have the following general structural formula:

wherein E is the aforesaid poly(oxyalkylene) chain-bearing organic moiety (i.e., a polyether group), R is a monovalent hydrocarbon radical, e is an integer having a value of from 1 to 2, f has a value of from 0 to 1, and the sum e-l-f'is from 1 to 2. When the sum e+f of general Formula B is 2, the polyfunctional siloxy units (B) of the polymers of this inventionvare difunctional and have the structural formula,

and the empirical formula,

which in abbreviated form is expressed as (E) (R )SiO, wherein f has a value of one when e is one, and f is zero when e is two. Formulas B and B-1, therefore, include both the mono(polyether)-substituted and the di(po1yether)-substituted difunctional units, ('E) (R)SiO and E SiO respectively. I

When the sum e+f of general Formula B is 1, the polyfunctional siloxy units (B) are trifunctionalland have the structural formula,

ple, a combination of the (R)(E)SiO and E-SiO monomeric units.

In the monofunctional siloxy units (C) of the polymers of this invention, one valence of silicon is associated with oxygen and each of the remaining three valences is satisfied by a bond to a carbon atom of a monovalent organic group, designated herein as R", as shown by the general structural formula,

which has the empirical formula, R SiO The R" group can be a monovalent hydrocarbon group, designated herein as R, or the R group can be a p'oly(oxyalkylene) chain-bearing organic moiety, also referred to herein as a polyether group and designated by the symbol Within any particular R SiO unit, or, as between different R SiO -units, the R groups may be the same or different. Thus in the monofunctional units (C), from 0 to 3 monovalent hydrocarbon groups (R) and correspondingly from 3 to 0 of the aforesaid polyether groups (E) can be bonded to silicon without departing from the scope of this invention. Obnsistent'with this definition, the monofunctional 'siloxy units (C) of the polymers of this invention have the following'more specific formula:

El ie 2 .(C-l) wherein R is a monovalent hydrocarbon group, E is the aforesaid polyether group, and each of g and h has a value of from 0 to 3, provided thesum g-l-h is 3. The preferred monofunctional siloxy I units encompassed by Formula C-l, are those in which g has a value of from O to' l and I: has a corresponding value of from 3 to 2.

In view of their monofunctionality, the C units of the I polymers of this invention cannot extend'the polymer network since they are' chain-terminating groups. This is in marked contrast to the reactivity of the above-described polyether-substituted diand tri-functional monomeric B units encompassed by general Formula B which, in view of their polyfunctionality, are chain-extending or polymerbuilding monomeric units.

The essential polyethertgroup (E) of the diand trifunctional siloxy units encompassed by Formula B above, and, when present, the polyether group of the monofunctional siloxy units (C), are more specifically defined by the formula, WO(C-,,H ,,O) L, wherein WO-(C,,H ,,O) is an organic end-blocked"poly(oxyalkylene chain and -L is a bivalent organic radical that links the poly- (oxyalkylene) chain, -(C,,H ,,O) to silicon. When this more specific expression is used in Formula B above in place of E, the following more detailed definition of the organo-substituted polyfunctional siloxy units (B) of the polymers of this invention is provided:

wherein, as above defined, e has a value of from 1 to 2, f has a value of from 0 to l, the sum e+f is from 1 to 2, and R is a monovalent hydrocarbon radical. Similarly, when the aforesaid formula of the polyether group is used in Formula C-l above in place of E, the monofunctional siloxy units (C) of the polymers of this invention are expressed by the following more specific formula:

when as above defined, g and h can each have a value of from 0 to 3, provided the sum of g-i-h is 3, and R is a monovalent hydrocarbon group. In the poly(oxyalltylene) chain, --(C,,H ,,O) of the respective monomeric units B and C of Formulas B-3 and C-2 above, d is a number having an average Value of from about 4 to about 30, and n can have a value of from 2 to 4, provided at least weight percent of the poly(oxyalkylene) chain is constituted of oxyethylene units, -(C H O)--. Usually, the average value of d is from about 5 to about 15, and the average value of n is from 2 to 2.25. The other oxyalkylene units with which the oxyethylene groups may be in combination are oxypropylene, -(C H O)-, and oxybutylene, (C H O), units. When the oxyethylene units are present in combination with other oxyalkylene units, the units of different types can be randomly distributed throughout the poly(oxyalkylene) chain or they can be grouped in respective sub-blocks, provided the total average content of (C H O), in the chain is at least 75 weight percent. Preferably, the total average poly(oxyethylene) content of the chain, (C,,H ,,O) is from about to about weight percent.

The bivalent organic groups represented by L in the above Formulas, B-3 and C-2 can be any of a variety of radicals ,havingfrom 2 to 14 carbon atoms and are usually hydrocarbon groups. Illustrative are such groups and the like, wherein R", in each instance, is a bivalent branched or straight chain alkylene radical having the formula, C,,,H m being an integer having a preferred value of from 2 to 4, of which 3 is particularly preferred, and R' in each instance is an arylene group having from 6 to 14 carbon atoms, including alkyl-substituted arylene groups. Typical examples of the linking groups (L are: ethylene (-CH CH trimethylene (-CH CH CH propylene As is evident from the above-described classes of bivalent linking radicals (L-), the unsatisfied valences thereof are associated with carbon and thus form a carbonto-oxygen bond with the poly(oxyalkylene) chain and a carbon-to-silicon bond with the silicon atom of the respective siloxy units.

As further indicated by the above Formulas B3 and -2, the poly(oxyalkylene) chain, (C H O) is terminated by the organic group, WO, wherein W is a monovalent organic capping group. Illustrative of the organic caps encompassed by W are such groups as:

wherein R, in each instance, is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, and is usually free of aliphatic unsaturation. The groups which end-block the poly(oxyalkylene) chains are, therefore, corresponding RO, R NHC(O)O and RC(O)O- monovalent organic radicals. In the aforesaid capping (W) and terminal (WO) groups, R can be any of the following: an alkyl group including linear and branched chain alkyl groups having the formula,

wherein y is an integer of from 1 to 12, such as, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl, octyl and dodecyl groups; a cycloaliphatic radical including monocyclic and bicyclic groups such as, for example, cyclopentyl, cyclohexyl and bicyclo[2.2.l]heptyl groups; an aromatically unsaturated group including aryl, alkaryl and aralkyl radicals such as, for exmple, phenyl, naphthyl, xylyl, tolyl, cumenyl, mesityl, t-butylphenyl, benzyl, betaphenylethyl and 2-phenylpropyl groups; alkyland arylsubstituted cycloaliphatic radicals such as, for example, methylcyclopentyl and phenylcyclohexyl radicals; and the like. It is evident, therefore, that the terminal group (WO) of the respective essential polyether groups (E) of the diand tri-functional siloxy units (B) of the polymers of this invention, as well as the terminal groups of the polyether groups (E') which may or may not be present in the monofunctional siloxy units (C), can be corresponding alkoxy, aryloxy, aralkoxy, alkaryloxy, cycloalkoxy, acyloxy, ary1-C(O)O-, alkyl carbamate and aryl carbamate groups.

The generally preferred R groups are phenyl, lower alkyl radicals, the lower alkyl-substituted aryl groups and the aryl-substituted lower alkyl groups, wherein the term loweralkyl denotes C -C alkyl radicals. Therefore, illustrative of the preferred capping groups represented by W of the above Formulas B3 and C-2 are: methyl, ethyl, propyl, butyl, phenyl, benzyl, phenylethyl acetyl, benzoyl, methylcarbamyl [CH NHC(O)-], ethylcarbamyl [C H NHC(O)--], propyland butyl-carbamyl groups, phenylcarbamyl [C H NHC(O)], tolylcarbamyl (CH C H NHC(O)-] benzylcarbamyl [C H CH NHC(O)-] and the like.

It is to be understood that the terminal organic radical (WO) of the respective polyether groups of the polymers of this invention may be the same throughout the polymer or may differ as between monomeric units. Likewise, the WO radical may also be the same or different within any particular unit containing more than one polyether group such as the difunctional siloxy units (B) of the E SiO type (encompassed by Formula Bl above), or the monofunctional siloxy units (C) of the E' R'SiO or E SiO type (defined with reference to Formula Cl above). For example, the polymer compositions of this invention can contain polyether groups in which the terminal group (WO) is benzyloxy (C H Cl-l O) and other polyether groups in which 8 WO is a hydrocarbylcarbamate group such as methylcarbamate, CH NHC(O)O.

When the polyfunctional siloxy units (B) of the polymers of the invention are difunctional, preferably one polyether group is bonded to silicon and the remaining valence of silicon is bonded to a monovalent hydrocarbon group, designated hereinabove as R. Thus, when in Formula B-3, for example, e is 1 and f is also 1, the difunctional units have the preferred structure:

wherein W, --(C H O) and L are as defined with specific reference to Formula B3. As also described above, monovalent hydrocarbon groups, designated as R, can also be bonded to the silicon atom of the monofunctional siloxy units (C) as defined by general Formula C-l above (that is, when h of Formula C-l has a value of 1, 2 or 3), The monovalent hydrocarbon groups represented by R and R are free of aliphaticv unsaturation and contain from 1 to 12 carbon atoms, and can be any of the following: an alkyl group including linear and branched chain alkyl groups encompassed by the formula C H l, wherein y is an integer from 1 to 12; a cycloaliphatic radical including monocyclic and bicyclic groups; an aromatically unsaturated group including aryl, alkaryl and aralkyl radicals; and other combinations of the aforesaid groups such as alkyland aryl-substituted cycloaliphatic radicals; and the like.

Typical of the aforesaid respective classes of R and R groups are: methyl, ethyl, n-propyl, isopropyl, n-butyl, tbutyl, octyl and decyl groups; cyclopentyl, cyclohexyl and bicyclo[2.2.l]heptyl groups; phenyl and naphthyl groups; xylyl, tolyl, cumenyl, mesityl and t-butylphenyl groups; benzyl, beta-phenylethyl, and Z-phenylpropyl groups; methylcyclopentyl and phenylcyclohexyl; and the like.

Of the alkyl groups represented by R and R, the lower alkyl groups having from 1 to 4 carbon atoms are preferred of which methyl is especially suitable. It is to be understood that within any one of the monofunctional hydrocarbylsiloxy units of the polymers of this invention, the R groups may be the same or different and that, as between monofunctional units, the R groups may also be the same or different. Similarly, as between the preferred difunctional siloxy units, (E)(R)SiO of the polymers of this invention, the respective R groups may be the same or different and may or may not be the same as the R groups of the monofunctional units. In the most preferred polymers of this invention, the monofunctional siloxy units (C) are of the R' SiO type, the difunctional units are of the (E) (R)SiO type, and essentially all of the R and R groups bonded to the silicon atoms are methyl groups.

The novel organosilicone polymers of this invention are depicted by the general expression,

in which the reoccurring monomeric units A are SiO and the reoccurring monomeric units B and C, are as described above with specific reference to Formulas B and C-1. When these respective definitions of the A, B and C units are included in the above expression, the polymeric compositions of this invention are expressed as follows:

wherein E and E are polyether groups having the formula, WO-(C H O) L, in which WO- is an organic terminal group of the poly(oxyalkylene) chain and -L is a bivalent hydrocarbon radical that links the chain to silicon, as defined above with particular reference to Formulas B-3 and C-2; and, as also previously defined, R and R are monovalent hydrocarbon groups, e is from 1 to 2 and f is from to 1, provided the sum 2+ is from 1 to 2, and each of g and h can be 0 to 3, provided the sum g+h is 3; and the relative proportions of monomeric units A, B and C, expressed on a mole basis, are defined by the relative values of a, b and c, respectively. The polymers of this invention contain from about 0.4 to about 2 moles of A per mole of B, and from about 0.2 to about 2 moles of C per mole of; B. Therefore, in the above expressions D and D-l, the ratio of 12:11 is from about 0.4:1 'to about-2:1, and the ratio of czb is from about 0.2:1 to about 2:1.

The polymers of this invention have a total polyether content of from about 50 to about 85 weight percent and a corresponding total siloxane content of from about 50 to about weight percent, the said polyether and siloxane contents being based on the combined total weight of the monomeric units A, B and C. As used herein, the expression total polyether content denotes the sum of the combined total weights of: (1) the polyether groups (E) that are bonded to silicon of the polyfunctional siloxy units (B), and (2) the polyether groups (13') when such groups are present in the monofunctional triorganosiloxy units (C). Accordingly, the expression total siloxane content denotes the sum of the combined total weights of: 1) the Slo units, (a) the polyfunctional B units less the total weight of the polyether groups (B), and (3) the monofunctional units less the total weight of the polyether groups (E') which may be present therein.

The organosilicone polymers of this invention can contain the tetrafunctional A units in combination with one or more of the various types of B and C units encompassed by the above Formulas B and C-l, respectively. Illustrative of such combinations are the following:

stow].tn-sromibuzusioml. 1)-a wherein 'E, E, R and R have the aforesaid significance; v, w, x and z are positive numbers, the sum v+w being equal to b and the sum x+z being equal to c; the mole ratio of the Sio units to total polyethensubstituted polyfunctional units to total monofunctional units (that is, the mole ratio of the [A]:[B]:[C] units, respectively) is defined by a:b:c in which latter ratio the values of a, b and c are as aforesaid (that is, a is from about 0.4 to about 2, b is 1, and c is from about 0.2 to about 2); and the total polyether content is maintained within the aforesaid range of from about 50 to about 85 weight percent, based on the combined total weight of the monomeric units.

The polymers of this invention are generally useful as surfactants and include compositions which find particular application in the manufacture of polyester urethane foam, including flame-retarded foam. Of the novel polymeric surfactants described herein, a generally preferred class, particularly for use in the formation of flexible polyester urethane foam, are the polymers represented by the following expression: 1

wherein R and R are preferably lower alkyl radicals having 1 to 4 carbon atoms, the link between the organicterminateed poly(oxyalkylene) chain and silicon is provided by the bivalent al-kylene radical, C H (m preferably being from 2 to 4); from 75 to about weight percent of the poly(oxyalky lene) chain is attributable to oxyethylene units and from 25 to 0 weight percent is constituted' of oxypropylene units; d has a preferred average value of from about 5 to about 15; and

the mole T8110 of'the tetrato'dito' mono-functional monomeric units is as aforesaid (that is, a:b:c is about 0.4 2;1;0.2-2). p

From the standpoint of providing greater operating latitude (that is, less dependency of foam quality, for example, on variables such as the concentration of surfactant in the foam-prodncing reaction mixture), it is generally preferred that the polymer contain from about 0.6 to about 1.8 moles of SiO units (A) per mole of polyfunctional siloxy units (B), from about 0.8 to about 1.8 moles of monofunctional siloxy units (C) per mole of polyfunctional siloxy units (B), and less than 3, and most preferably not more than 2.8, total moles of A+C units per mole of B units. Thus, in the preferred a:b:c ratio, a is from about 0.6 to about 1.8, b is 1, and c is from about 0.8 to about 1.8, and most preferably, a+c:b is from 1.421 to 2.8:1.

From the standpoint of having a superior over all combination of properties for the stabilization of flexible polyester foam, the most preferred polymers of this invention are as follows:

wherein d has an average value of from about 5 to about 15; m has a value of from 2 to 4; a:b:c has the aforesaid preferred value of 0.6-l.8:1:0.8-1.8, provided a+c:b is 1.4-2.8:1, and R is phenyl, lower alkyl, lower alkaryl or aryl-substituted lower alkyl groups. Particularly effective for the stabilization of flame-retarded flexible polyester urethane foams, are polymers in which at least a major proportion of the poly(oxyalkylene) chains are terminated by R 0 groups where the organic cap (R is benzyl.

In the preparation of the organosilicone polymers of this invention, silicon-containing reactants, designated herein as reactants A, B and C, are employed in which silicon is bonded directly to hydrolyzable groups the number of which corresponds to the number of oxygen atoms bonded to silicon of the respective monomeric units A, B and C. The hydrolyzable groups can be halogen, radicals bonded to silicon through an oxygen atom, and any combination thereof. Illustrative of suitable reactants (A) from which the tetrafunctional monomeric units (A) are derived are those encompassed by the general formula:

wherein X is halogen (usually chlorine or bromine), Y is a hydrocarbon radical such as alkyl, aryl and aralkyl, and the like, and p, q and r can each have a value of zero to 4, provided the sum p-i-q-i-r is four. Typical examples of this reactant are silicon tetrachloride, lower alkyl orthosilicates having the formula, Si(OY) wherein q is 4, and the partial lower alkyl esters of silicon tetrachloride, (Cl),,Si(OCOY'),', wherein each of p and r has a value of from 1 to 3, provided p+r is 4, and Y in each instance is an alkyl group having from '1 to 4 carbon atoms. Tetraethoxysilane (also 'known as tetraethyl orthosilicate or simply as ethyl orthosilicate) is especially suitable as the A reactant.

Reactant B which is the ultimate source of the polyether-substituted polyfunctional monomeric B units contains from 2 to 3 hydrolyzable groups bonded to silicon depending upon whether it is desired to provide difunctional or trifunctional units in the polymer. Suitable as the B reactants are compounds encompassed by the general formula:

wherein R corresponds to the monovalent hydrocarbon group (R) of the polyfunctional B units encompassed by general, Formula 3 above; E is either hydrogen orthe polyether group (B) of general Formula B above, having the more specific structure, WO(C,,H ,,O) -L, whereinthebivalent linking group (--L-) is preferably an alkylene group, C H as defined above with reference to Formula B 3; e and 1 also have the same significance as in the monomeric polyfunctional B units (that is, e is from 1 to 2, f is from O to 1, and the sum e14 is 1,.to 2); X and (are as above-defined withrespect to reactant A, and each of s,'t and u can be 0 to 3, provided the .sum s+t+u is from 2 to 3, and the sum e+f+s+t+u is .4.

Illustrativeof the various types of reactants encompassed by Formula B are the following:

wherein R and the preferred organic capped polyether group WO(C H ,,O) C H are as above-defined with specific reference to Formula B-3 of polyfunctional monomeric units B, X is halogen (usually chlorine) and Y is usually a lower alkylgroup (Y) such as methyl or ethyl. In the preparation of organosilicone polymers of this invention in which a combination of different polyfunctional siloxy units B are present, such as the (E)(R)S iOz 2 and n-s iom units, more than one B. reactant is required. For example, in preparing the polymers illustrated aboveas D6 and D-7, .the respective diand tri-functional siloxy units are obtained by employing a combination of corresponding B reactants such as the aforesaid reactants B'l and B'-'7. Alternatively,'such polymers are provided by employing a combination of hydrosilanes such as reactants B'2' and B'8, as the source of the siloxane portions of the respective B units, and the silicon-bonded hydrogen is subsequently replaced by the polyether groups (E), as described hereinbelow. It is to be understood that a combination of polyether-substituted and hydrogen-substituted reactantssuch as B'1 and B'8 can also be employed without departing from the scope of this invention.

Reactant C which is the ultimate source of the monofunctional triorganosiloxy units (C) of the polymers of this invention, contains one hydrolyzable group and is represented by the following general formula:

E",-S iZ (0') wherein R corresponds to the monovalent hydrocarbon group (R) of the monofunctional C units'encompassed by Formula C-l above; E is either hydrogen or the polyether group (B) of Formula C-l above, having the more specific structure, WO(C H O) -L-, wherein the bivalent linking group (-L) is preferably an alkylene group (C H as above defined with specificreference to Formula C2; g and h also have the same significance as in the mono-functional monomeric C units (that is, each of g and It can be from 0 to 3, provided their sum is 3); Z can be any of the aforesaid hydrolyzable groups, designated as X, OY and -OC(O)Y and can additionally be a hydroxyl group or, when'g iszero, Z can also be an -OSiR group in which event the C7 reactant is a disiloxane.

Illustrative of the various types of reactants encompassed by Formula C are the following:

wherein R and the preferred organic capped polyether group, WO(C,,H ,,O) C H are as defined with specific reference to Formula C-2 above of the monofunctional C units; X is halogen (usually chlorine) and Y is usually a lower alkyl group (Y) such as methyl or ethyl. In preparing organosilicone polymers of this invention in which a combination of different monofunctional siloxy units are present, such as the R SiO and (R )2 (E )SiO z units, more than one C reactant is required. For example, in preparing the polymers illustrated above as D-7 by employing a combination of corresponding C reactants such as the aforesaid reactants C1 and C5, or the aforesaid reactants C'-1 and C'7. When employing a hydrosilane such as reactant C7, the silicon-bonded hydrogen is subsequently replaced by the polyether group (E), asdescribed hereinbelow.

The organosilicone polymers of this invention are produced by the process which comprises cohydrolyzing the above-described reactants A, B'iand C and cocondensing the hydrolyzate, thereby providing either the polymer composition of the invention as the direct product of the cohydrolysis-cocondensation reaction, or an intermediate siloxane polymerproduct containing silicon-bonded hydrogen which is reacted furtherto substitute silanic hydrogen with polyether groups. Reactants A, B' and C are employed in respective amounts selected to provide the corresponding monomeric A, B and C units in the relative molar proportions defined above as the azbzc ratio in which ratio the values of a and c are from about 0.4 to about 2 and from about 0.2 to about 2, respectively, expressed on the normalized basis of b=1. Accordingly, in producing the polymers of this invention, from about 0.4 to about 2 moles of A are employed per mole of B and from about 0.2 to about 2. moles of C'- are employed per mole of B. Water is preferably used in an amountat least sufficient to satisfy the stoichiometry of the cohydrolysis reaction. Usually, Water is used in a 10 to 200 percent'molar excess of the stoichiometric requirements, although mor'efthan 21, 200 percent molar excess can be employedwitho'ut departing from the scope of this embodiment "of the present invention.

The cohydrolysis-cocondensation reaction for producing the novel polymers described herein is illustrated by the following Equation 1 wherein for convenience, tetrawherein, as above-defined, E is either hydrogen or a polyether group (B); E" is either hydrogen or apolyether-group (E); R and R' are monovalent hydrocarbon groups; eis ,from 1 to 2 and 'f is from to 1, provided ei-l-f is from 1 to 2 s is from 2 to 3, provided+f+s is 4; each of g and h can be 0 to 3, 'provided'g+h' is 3; af, b and; c which represent the number of moles of the indicated A, B and C reactants, can be any positive numbers provided the ratio thereof, that is, 'izzbzc', when expressed on the normalized basis of b l, is about 0 4,2:1:0.2-2, thereby providing polymers 'in which the respective monomeric units A, .B and C are present 'in corresponding molar proportions, the azbzc ratio also being, about 0.4- 2: 1:0.21. Provided the ratio of the number of moles of reactants employed is as specified, the actual number of moles employed (and thus the quantity of polymer produced) can be any multiple of the a':b:c ratio, depending upon the scale on which it isdesired to carry out the reaction. I

When the B reactant employed in the cohydrolysiscocondensation reaction of Equation 1 is a hydrosilane (such as, for example, reactants B2, B6 and B8 above), the product thereof is reacted further with a monoolefinic poly(oxyalkylene) ether having the formula WO-(C H O) C H In the ether reactant, the moiety, WO(C H O) is as above-defined with respect to the corresponding organic terminated poly(oxyalkylene) chain of the pplyether substituted polyfunctional siloxy units (B), and --'C H; [i s a monovalent olefinic group wherein m has the same significance as in the bivalent alkylene group (--C H of the polyether substituents (E) of monomeric unitsB (that is, m has avalue of from 2 to 14, and is .usually irom 2 to 4). This embodimentof the method for producing the novel polymers of the present invention is illustrated by the reactions of the following'Equations 2 and 3 wherein, tetraethoxysilane and a trihydrocarbyl monochlorosilanetypically illustrate the A and C reactants, respectively, the B reactant is shown vas a hydro; carbyl-substituted dichlorohydrosilane and, for: the pur pose of illustration, the A, B- and G? reactants are used in equimolar proportions: V, I

EquatlonZ Y- 1 w n s1 o 02m). R-sr-cn ms1or+ agsn'io .4 v a, g R

-{SlO4 Q].[WO:(CsHzn0)arrCmHznrsiOzljblR'a ilzla Since the reaction of Equation 2 is illustrated onthe basis-of equimolar amounts of reactants A, B and C, the mole ratioof azbzc in Equations 2 and 3 is, of course, 1:1:1; When the C reactant containssilanic hydrogen, the product of the cohydrolysis-cocondensation reaction is reacted in a' similar manner with theaforesaid monoolefinic ether reactant to provide monomeric C units containing a polyether substituent (E'). Further when reactant B' (or C) contains more than one silicon-bonded 14 hydrogen atoms as in reactant B- 6 above, for example, the intermediate product of the r'e'actionof Equation 2, is reacted with a corresponding nurrr er of moles-of the monoolefinic polyether reactant."

ployed in equimolar amounts: {Equation 4) 1 1 iczmon 3H Cl wherein R, R',-WO,- n,--'d and m are as previously defined herein and the mole ratio (a:b:c) of-the respective monomeric units is 1:121, In providing polymers of this invention in which the monomeric B units are trifuiictional (that is, E-SiO the reaction of Equation 4 is carried out employing a mono(polyether)-substituted silane containing three hydrolyzable groups as the B reactant such as, for example, the trichlorosilane having the formula, WO(C H O) C H SiCl Further, in producing polymers of this invention containing one or more of the polyether-substituted monofunctional C units of the type, ')2 1 2 ')2( 1/2 )3 i 1'/2 the hydrolysis-cocondensation reaction of Equation 4 is effected using the respective mono-, dior tri(polyether)- substituted monochlorosilanes encompassed by Formula C in place of, or in addition to, the R SiCl reactant shown in Equation 4. A Reactants B encompassed by Formula B above in which one or two polyether groups (E) are bonded to silicon, and reactants C encompassed by Formula C containing from one to three polyether group (E), are prepared by reacting the aforesaid monoolefinic poly(oxyalkylene) ethers, WO(C H O) C H with hydrosilanes in which the number of silicon-bonded hydrogen atoms corresponds to the number of polyether groups desired in the monomeric B or C units. For example, the B reactant shown in Equation 4 above, is prepared in accordance with the following Equation 5 and reactants C of the E) (R') SiCl and (E) (R')SiCl type, are prepared as illustrated by Equationso and 7 below.

Equationfi 1 is preferably vinyl, allyl or methallyl, the allyl group being especially suitable. The monoolefinic polyether reactants usedin the reactions of Equationsfi and 5-7 above, can be prepared by starting alkylene oxide polymerization with a monoolefinic alcohol such as allyl alcohol to provide HO(C,,H O) -C H (wherein n and. d are as previously defined herein and in has a value of at least 3), followed by capping of theterrninal hydroxyl group withthe aforesaid. organic radical, W.-, such as methyl, phenyl, benzyl, acetyl, methylcarbamyl and like capping ,groups ,Further details concerning the method of preparation of such polyether reactants are disclosed in pending application Ser. No. 109,587, filed Jan. 25, 1971, of L. Mjorehouse, now abandoned. Alternatively, the polyether-reactants can be prepared by sta rting thealkylene oxide polymerization with an alkanol such as methan01, an aralkyl alcohol such as benzyl alcohol, a phenol and the like, followed by capping of the terminal hydroxyl group of the reaction product with the monoolefinic group 'such as vinyl, allyl, methallyl and the like.- Of these various polyether reactants, allyl alcohol-started poly- (oxyalkylene) ethers are especially suitable.

The addition of the sil'anic hydrogen of the respective silane reactants of Equations 5-7, as well as the addition of the silicon-bonded hydrogen of the intermediate polymer product shown by the reaction of Equation 3, to the monoolefinic group,-C H (e.g.,

of the polyether reactant, is platinum-catalyzed. Usually, platinum is used in the form of chloroplatinic acid in a catalytic amount such as from 5 to 150, preferably from 10 to 50, parts per million parts by weight of the siliconcontaining and polyether reactants. Suitable reaction temperatures range from about room temperature C.) to about 150 C. If desired, the addition reaction may be conducted in the presence of liquid aromatic hydrocarbons such as toluene and xylene, although other nonreactive solvents can be used.

When the organic radical (W--) of the terminal group (WO--) of the poly(oxyalkylene) chain of thedior, trifunctional monomeric units (B) is a monovalent hydrocarbon group (that is, the above-defined R group) such as methyl, phenyl and benzyl groups, the novel polymers described herein are preferably prepared in accordance with the method illustrated by the reaction of Equation 4 above, in which the B reactant already contains the polyether group (E) and the polymer is the direct product of the cohydrolysis-cocondensation reaction. Likewise, polymers in which the monofunctional siloxy units (C) contain polyether groups (E') capped by 'a monovalent hydrocarbon radical (R), are also preferably prepared as the direct product of the cohydrolysiscocondensation reaction. When the organic cap (W) of the polyether group of the B units (or C units)"is an acyl (R CO) or carbamyl (R NHCO-) group, it is usually preferred to prepare the polymers of this invention in accordance with the reactions of Equations 2 and 3 whereby, as shown, the polyether groups (E and, when present, E) are introduced in a step subsequent to the cohydrolysis-cocondensation reaction.

The above-described cohydrolysis-cocondensation reactions. for producing the organosilicone polymers of this invention can be carried out at temperatures from about 25 C. to about 150 C., in the presence or absence of a solvent or diluent. The presence of solvents may aid by increasing compatibility between reactants, effecting distribution, and thereby avoiding gel formation and controlling reactionrates. Useful solvents are aromatic-hydrocarbons (such as, for example, toluene and xylene), mixtures of aromatic hydrocarbons, low molecular weight alcohols (such as, for example, isopropanol), ethers including low molecular weight polyethers 'inwhich hydroxyl groups initially terminating the chains have been caped with an organic group (such as, for example, meth- .16 yl) and other solvents whichiare non reactive,with silicqnbonded functionalgroups. v(such, as Si-H,'."Si,-Cl.. f arid Si-OY) of the -A",'B and'C reactants. l i

The by-products of the cohydrolysis-cocondensation reaction depend, of course, on the nature of the hydrolyzable groups of the A, 1B and C -reactants,. a;nd are readily removed from the .polymerinc product, usually by fractional distillation. For ex'a'iiiplefthe'ethanol and hydrochloric acid formed as by-products. of the illustrative reactions of Equations .1, 2 and fl; above, are readily removed, together wi'th ex'cess' water, as a actants, as illustrated by Equation 3 above.

In addition to the monomeric A, B and C units,tlie polymers of this invention maycontain residual silanols' and residual hydrolyzable groups remaining from thereactants employed in the preparation thereof. In addition, a small percentage (on the average, usuallyab'out'10 mole percent or less) of the total polyether groups (E and, when present, E) may be residual, uncapped hydroxyl-terminated groups [that is,

no-t gu on amw-i introduced with the monoolefinic poly(oxyalkylene ether reactants employed in the. reaction of Equation 3 above, or in theprepar'ation of the B (or C) reactants as illustrated by the above Equations 57. In the use of'the poly mers of this invention as stabilizers. of polyester foam, the total weight of the aforesai'd residual groups should be no higher than about 10 weight'percent, and is pref erably less than '6 weight percent, based o'n the total weight'of the polymer: Y The'conten-tof such residual' groups is substantially reduced and minimized by treatment of the polymeric products with an organicisocyanate in the"presence' er an amine catalyst such as those described hcreinbelow'as suitable'for the ureathane-forming reactionffor example, 'triethylamine and N ethylmorpholine), or a metal catalyst such as organo-tin compounds (for "example, stannous octoate, dibutyltin laurate, and the like).;Usually=, the organic isocyanate employed in this treatment is an alkyl, aryl or aralkyl mono-isocyanate, such as methyl, ethyl, phenyl, benzyl isocyanat'e's,'and the'like. The treat ment of the polymer product in this manner may be carried" out in the presence orabsence of a solvent or diluent. Aromatic hydrocarbons such as xylene and tolueneare suitable as the solvent medium.

The polymer compositions ofthisinvention are ligands and havernolecula'r weights whichvaryover a relatively wide range. Generally, the average molecular Weights of the polymers of this invention-range from about 1000 to about 20,000 (as measured by; Gel Permeation Chromatography using a calibration curve based on dimethylsiloxane fluids). z a a p The organosilicone polymers of this invention are mixtures of polymer; species which diif erin molecular weight, polyether, and, siloxane contents, and relative rnolarjproportions ofgthe.monomeric units. It islto be understood, therefore, that as expressed-herein, the-values @of these parameters are average :values. v

1 7 'The organosilicone polymers of this invention are effective as stabilizers of flexible polyester urethane "teams and can, therefore, be used as such without'the need-for Combination with an anionic or cationic organicsurfact ant, or other type of organic additive. The polyrners can be employed as a 100 percent active stream, or they can be employed in dilute form as a solution in polarsol vents (e.g., glycols) or non-polar organic solvents-such as normally liquid aliphatic and aromatic unsubstituted and halogensubstituted hydrocarbons (e.g., 'heptane, xylene, toluene, chlorobenzenes and the like). In addition toth'e' polymers, the other essential types ofcomponents' and reactants employed in the production of flexible polyester urethane'foam in accordance with" the process of this invention are polyester polyols, organic polyisocyanates, amine catalyst and blowing agent. When producing self-extinguishing foams, the foam-producing reaction mixture also contains a flame retardant. The organosihcone polymers of this invention are usually pres= ent in the final foam-producing reaction mixture in amountsof from about 0.15 to about 4.0 parts by weight per 100 parts by weight of the polyester polyol reactant; It 'is often the preferred practice of foam manufacturers to premix the foam stabilizer, amine catalyst and ,water (which is the usual source of at least part of the blowing action), and to feed the aqueous premixture to the foamproducing reaction mixture as a single stream. The mere mixing of the organosilicone polymers of this invention with the catalyst and water, however, forms a heterogeneous mixture which detracts from the processing advantage of adding these components as a combined stream rather than as individual streams. The problem of premix incompatibility is overcome in accordance with the present invention by providing homogeneous aqueous premixtures comprising the organosilicone polymer, aminecatalyst, an organic acidic component and, as an additional ingredient, either a water soluble organic surfactant or a water soluble "glycol, or both of the latter two types of corhponentsQAlthough these various organic additives can be introduced directly to the aqueous premixture of foam stabilizer and catalyst, the formation of clear, homogeneous'aqueous solutions is facilitated by blending'the additives with the foam stabilizer (that is, the organosilicone polymers of this invention) and combining the resulting blend with water and the amine catalyst system. In accordance with another embodiment er this invention, therefore, solution compositions are provided comprising theorganosilicone polymers of this invention,"th'e aforesaid organic acidic component,and one or both of an organic surfactant and glycol. The organosilicone polymer is present in the solution compositions in an amount of from about 1( to about 80 parts by weight per 100 parts by weight of the solution. The aforesaid organic acidic component comprises the saturated and unsaturated aliphatic and cycloaliphatic carboxylic acids containing from 15 to 20 carbon atoms. Illustrative of suitable acidic components are the fatty acids such as, for example, palmitic, stearic, palmitoleic, oleic, linoleic, linolenic and ricinoleic acids; resin acids of the abietic and pimaric type; and any combination of the aforesaid acids as Well as industrial by-products and naturally-occurring materials comprising such acids. An especially suitable acidic acomponent of the solution com positious and aqueous premixtures of this invention is tall oil which is a by-product of sulfate digestion of wood pulp and is composed largely of fatty acids (oleic, linoleic, linolenic and palmitic acids) and resin acids, and a minor amount of neutral material such as fatty acid esters.v

The above-described organic acidic component is 'present in the solution compositions of this invention in an amount of from about 5 to about 90 parts by weight per 100 parts'by weight of organosilicone polymer. presentin the solution.

The water-soluble organic surfactant which can be a component of the solution compositionsof this invention 18 m y be'of the nonionic,-anionic, cationic or amphoteric types, including combinations ther offPreferably, the organic"'s'urfactaht is a nonionic surfactant such as: the poly (oxyalkylene) ethers ofthe" 'highralcohols having fr'o'rrilQ w 18 carbon atoms including mixtures thereof; polyoxyalkylene e'the'rs of alkyl-substituted phenols in which the"'alkyl groupkan hav'e 'from 61to*15carbon atoms; 'and corresponding polythioalkyl'enejadducts'of the aforesai 'higher' alco hols and ph'e'nol's'fThe length of the ether chain is'sucli thatappr opriatehydrophilic charactei' is p'rovided to balance the hydrophobic "portion" derived from the alcohol or phenol'and render 'the'compoun'd soluble in water. The chain may contain oxyethylene units either as essentially the sole type 6f unitor oxyethylene in: combination with aminor amount of oxypropylene. It" is preferred that the hydrophilicp'ortion of the nonionic surfact ant'sbe composed essentially of'oxyethylene monomeric units. Usually the ave'ragefnumber of such -OC H unitsi ranges from about"4" to seen 20, alth'oughu'pwards of40 such units can alsdbe'present.

Typical examples of nonionic surfactants'v'vh i'ch can'b e used as components of the solution compositionsof this invention are theadducts produced by reaction of k moles of ethylene oxide (wherein k has a value of from-about 4 to about 40, inclusive of whole and fractional "numbers) per moleof any of the following hydrophobes'in cludin gmixtu'res thereof: n-undecyl alcohol, myristyl alcohol, lauryl alcohol, trimethyl nonanol, 'tridecyl alcohol, pentadecyl alcohol, cetyl alcohol, oleyl alcohol, stearyl alcohol, nonylpheuol, dodecylphenol, tetradecylphenol, and the like.

Other illustrative water soluble organic surfactants which can be present as a component of the solution compositions of this invention are: sodium, potassium, ammonium andfquaternary ammonium salts of sulfonic'acids wherein the hydrocarbyl portion can be alkyl or alkaryl groupscontaining from 10 to 20 carbon atoms. Examples of such" organic surfactants are: sodium tetradecyl sulfona'te'and sodium dodecylbenzene sulfonate; sodium and potassium salts of sulfonated petroleum fractions such as mineral oil; diethylamine salts of sulfonated C -C alkylated aromatic hydrocarbons; taurine compounds having at least onelong chain hydrocarbyl group bonded "to nitrogen; and the like.

The solution compositions of this invention may also contain, a'sfa third type of organic component, a glycol of from 2"to about 10 carbon atoms, or low molecular weight Carbowax polyethylene glycols. Especially suitable is he'xylene glycol (2-methyl-2,4-pentanediol).

Wherrboth'the organic surfactant and glycol components'ar'e present in the solution compositions of this invention, the combined concentration thereof ranges from about 5 to aboutparts by weight per parts by weight of the organosilicone polymer contained therein. When only one of these components is present, the concentration'thereof is' also within this latter range.

When the aforesaid solution compositions of the organosilicone polymers of this invention are combined with water and amine catalyst such as the catalystsdescribed hereinbelow, clear, homogeneous aqueous solutions areobtained which can be added directly to the foam-producing reaction mixture. From the standpoint of r etaining'lfthese desirable characteristics of clarity and homogeneityfunder otherwise adverse ambient temperatureswhi'ch may be encountered upon standing, storage or shipment prior to use in the foam-producing reaction, the pr'eferred aqueous premixtures are those containing both the organic surfactant (of which nonionics are preferred). and the glycol, in addition to the organic acidic component. It is to beunderstood that the aforesaid solution compositions of the organosilicone polymers of this invention are also useful when added directly to the final foam-producingreaction mixture rather than being premixed with-water and amine catalyst,

stabilizers of this invention and/or the aminecatalyst are, employed as respeetivesolutions,v water soluble carrier sol ventsand components thereof are, of ,course, introduped t into the aqueous hpremixtures without, however, any deleterious 'affecton the effectiveness-,or hornogeneity o f; the aqueous solution premixtures. r

The relative proportions of the organo-silieope fo am stabilizer of this invention, the amine catalyst andwater imanyparticular solution are=1arge1y dependent upon determined by'the relative proportions of such ingredients which aretdesired in" a. particular foam-producing reaction. mixg re. Aceordingly, the preparation of, aapartieular, aqt egus premixture of this, invention, the-relative proportism p hetq m-s a l ene n cata t and water re adjusted and,v the aqueousprernixtnre is addedto the final foam-producing formulation; in; an amount suificient to at s ythe-res e t ve functions f su 'hn m nent and to, provide ,a-foamed productof desired quality.,; :Tfho, polyeste'r poly-ols employed Iin ,producing flexible foams in accordance with the process of this invention are thereaction products of polyfunctional organic carbpxylic acids and polyhydric alcohols, The polyester polyols con-' that can be employed in producing polyester polyols useful] in, this invention are: dicarboxylic aliphatic acidssuchfas succinic, adipic, sebacic, azelaic, glutaric, pimeliq malonic and suberic acids; and dicarboxylic aromatic acids such-as phthalic acid, terephthalic acid, isophthalic: acid and the like. Other polycarboxylic acids that can beemployed are the dimer acids such as the dimer of linoleic aci dp Hydroxyl-containing n onocar boxylic acids (suchas ricin acid) canalso be used. Alternatively, the anhydridesp any of these various acids can be employed in produci g ,.the. v

polyester polyols.

The polyhydric alcohols (organic polyols) employed in producing the polyester polyol starting .mial-l. terial used in the process of this invention ,ineludqthe monomeric polyhydric alcohols such as, for example, glycerol; 1,2,6-hexanetrioh ethylene glycol; diethylene'glycoli' trimethylol propane; trimethylolethane; pentaerythritol; propylene glycol, 1,2-, 1,3- and 1,4'-butylene. glycols; 1,155 pentanediol; sorbitol; and the like, including mixtures th r f- L I Other polyhydricalcohols that can be employed in producing: the, polyester. polyols useful inthis" invention are the polymeric polyhydric alcohols which include thelinea r and branched chain polyethers having a plurality of acyclic ether oxygens and at least two alcoholic hydrgxylfradicalsi Illustrative of such polyetherpolyols'are'tlie polyfo'xy-f alkylene) polyols containing one or more e insof connected oxyalkylerie radicals which are prep d by reaction of one or more alkylene oxides with ac yclic an alicyclic polyolsQExam ples of the -poly(oxyalkylen)poly ols include the poly(oxyethyl'ene) g'lycols'prepare'd by the addition of'ethylene oxide to water, ethylene gIycoPor'diethylene glycol; poly (oxypropylene) glycols prepared by the addition of ro ylene oxide to wa ,-p py g y-' col or dipropylene glycol; mixed oxyethylene-oxypropylene polyglycols prepared in asimilar mannerutiliging a mixeture of ethylene oxide and propyleneoxide or a sequential addition of ethylene oxide and propylene oxide; and the poly(-oxybutylen e) glycols and copolymers such as pol-y; (oxyethylene-oxybutylene) glycols and poly(oxyproplyene-oxybutylene) glycols. Included in the term-p o1y.(oxybutylene) glycols are polymers of 1,2-butyleneoxide and 2,3-butyleneoxide. y I v I;

illustrative of further polyester polyol reactants that; areiuseful inproducing-flexible. polyester urethane. foam in; accordance with the'process of this invention are the reac: tion. products of any of the aforesaid polycarboxylic acids and thepolyhydric alcohols prepared by the reaction of one -or more alkylene oxides such as ethylene oxide,-

proylene oxide, butylene oxide and mixturesthereof, with any 'ofthe following: glycerol; trimethylolpropane; 1,2,6:

hexanetriol; pentaerythritol; sorbitol; glycosides such as methyl, ethyl, propyl ,=butyl and 2-ethylhexyl arabinoside,

xyloside, fructoside, glucoside,-and rhamrnoside; sucrose;

' mononuclear polyhydroxybenzenessuch-.as resorcinol,

pyragallol, phloroglucinol, hydroqu-inone,.4,6-di-tertiarybutylcatechol, and catechol; polynuclear hydrox-ybenzenes (polynuclear designating at least two benzene nuclei) such as the di-, triand tetra-phenylol compounds in which two to four hydroxybenzene groups are attached eitherdirectly .by'means of single bonds or through an aliphatic hydrocarbon radical containing one to twelve carbonatoms,'such compounds being typically illustrated by 2,2- bis(p-hydroxyphenyl) propane, bis (p hydroxyphenyl)- methane and the various diphenols and diphenol methanes disclosed in U.S. Pat. Nos. 2,506,486 and 2,744,882, respectively. Another type of polyester polyol reactant is that produced by reaction'of a polycarboxylic acid and the polyether adducts formed by reaction of ethylene oxide, propylene oxide or butylene oxide with phenol-formaldehyde condensation products suchas the novolaks.

. The organic polyisocyanates that are useful in producing flexible polyester urethane foam in accordance with the processof this invention are organic compounds that con-t.

tain at least two isocyanato groups. Such compounds are well known in the art of producing polyurethane foams,

and are conveniently represented by the general formula:

where i is aninteger of two or more and is a; organic radical having the valenceof i. Q can be a substituted" lllustrative of suitable organic polyisocyanate reactants are thefollowing including mixtures thereof? 5 i' yanato6-butoxy-hexane;

bis(.3-'isocyanatopropyl)ether; 1- the (his (3'-isocyanato-propyl)ether of 1,4;butylene glycol;

bis(2-isocyanatoethyl)carbonate; 1-rnethyl-2,4-diisocyanato-cyclohexane;

and many other organic polyisocyanates that are known in the art such as those disclosed, in an article by Siefken, Ann., 565, 75 (1949). In general, the aromaticallyunsaturated polyisocyanates are preferred.

Further included among the isocyanates useful in the process of this invention are dimers and trimers of isocyanates and diisocyanates and polymeric diisocyanates such as those having the general formula:

in which i and j are integers of two or more, and/or (as additional component in the reaction mixtures) compounds of the general formula:

L'(NCO) in which i is one or more and L is a monofunctional or polyfunctional atom or radicalLExamp'les of this type include ethylphosphonic diisocyanate, C H P(O) (NCO) phenylphosphonic diisocyanate, C H P(O)(NCO)' compounds containing an ESiNCO group, isocyanates derived from sulfonamide's (QSO NCO), cyanicacid, thiocyanic acid, and compounds containing a metakNCQ radical such as -tributyltin isocyanate.

Also included as useful in the preparation of the flexible polyester urethane foams in accordance with the process of this invention arethe polyisocyanates of the anilineformaldehyde polyaromatic type which are produced by phosgenation of the polyamine obtained by acid-cata lyzed condensation of aniline with formaldehyde. Poly- (phenylmethylene) polyisocyanates of 'this' type are'available commercially under such trade names as PAPI, AFPI, Mondur MR, Isonate 3901, NC O -l20 and NCO.- 20. These products are low viscosity (SQ-.500 centipoises at 25 C.) liquids having average isocyanato functionalities in the range of about 2.25fto about v3.2 or higher, depending upon the specific aniline-to-formaldchyde molar ratio used in the polyamine preparation. I Other useful polyisocyanates are combinations ofdiisocyanates with polymeric isocyanates containing more than two isocyanto groups per molecule. Illustrative of such combinations are: a mixture of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate and the aforesaid poly- (phenylmethylene) polyisocyanates; and a mixture of isomeric tolylene diisocyanates with polymeric tolylenediisocyanates obtained as residues from' the' manufacture of the diisocyanates. The polyisocyanate reactant of the foam-producing reaction mixture is generally employed in an amount that provides from about 80 to about 150 percent, usually from about 90 to about 120 percent, of the stoichiometric amount of the isocyanato groups required to react with 22 all of the hydroxyl groups of the polyester polyol reactant and any water present as a blowing agent. That is, the total -'NCO equivalent to total active hydrogen equivalent is generally within the range of about 0.8 to about 1.50, usually about 0.9 to about 1.2, equivalents of -NCO per equivalent of active hydrogen.

The reaction mixtures employed to produce flexible polyester urethane foam in accordance with the teachings of the present invention also contain a catalyst for accelerating the isocyanate-reactive hydrogen reaction. This component usually comprises a tertiary amine and is typically illustrated by the following: N-methylmorpholine; N-ethylmorpholine; N-octadecylmorpholine (N-cocomorpholine); triethylamine; tributylamine; trioctylamine; N,N,N',N-tetramethylethylenediamine; N,N,N',N'-tetramethyl-1,3-butane diamine; triethanolamine; N,N-dimethylethanolamine; triisopropanolamine; N-methyldiethanolamine; bis(Z-dimethylaminoethyl)ether; hexadecyldimethylamine; N,N-dimethylbenzylamine; trimethylamine; triethylenediamine (i.e., 1,4-diazabicyclo[2.2.2]octane); the formate and other salts of triethylenediamine, oxyalkylene adducts of the amino groups of primary and secondary amines and other such amine catalysts which are well known in the art of flexible polyurethane foam preparation. Although metal-containing catalysts such as stannous octoate are usually employed in the preparation of flexible polyether urethane foam, such metal catalysts are not preferred in the manufacture of flexible polyester foam.

It is to be understood that the aforesaid amines may be used as essentially the sole amine catalyst of the reaction mixtures employed in this invention or any combination of two or more such amines may be employed. The amine catalyst may also be introduced into the reaction mixture in the form of a solvent solution containing from about 10 to about weight percent of total active catalyst. Suitable carrier solvents of amine catalysts include water-soluble glycols such as diethylene glycol; dipropylene glycol; and 2-methyl-2,4-pentanediol (hexylene glycol).

The catalyst may also be used in combination with other additives such as any of the non ionic organic surfactants described above in connection with the solution compositions of this invention. Examples of non-ionics which are especially useful as components of the catalyst solutions are the oxyethylated nonylphenol compounds represented by the general formula wherein k is a number having an average value of from about 9 up to about 20 or more, including average values of k which are either whole or fractional numbers such as 9, 10.5, 15 and the like. When used, the non-ionic organic surfactant may be present in an amount from about 10 to about 80 weight percent, based on the total weight of the catalyst solution. The catalyst solution may also include minor amounts of polysiloxane-polyoxyalkylene block copolymers and/or the organosilicone polymers of this invention.

It is to be understood that any of the aforesaid amine catalysts or solutions thereof can be added directly to the foam-producing reaction mixture or they can be added in premixed form with water and the polymeric organosilicone foam stabilizers of this invention. In the latter event, the catalyst is preferably added as a component of the abovedescribed homogeneous aqueous premixtures of this invention.

The amine catalyst is present in the final foam-producing reaction mixture in an amount of from about 0.2 to about 8-parts by weight of active catalyst (that is, the amine exclusive of other components present in solutions thereof) per parts by weight of the polyester polyol reactant.

Foaming can be accomplished by employing a minor amount of a polyurethane blowing agent such as water, in'the reaction mixture, the reaction of water and isocyanate generating carbon dioxide blowing agent, or

through the use of blowing agents which are vaporized by the exotherm of the reaction, or by a combination of the two methods.. These various methods are known'in the art. Thus, in addition to or in place of wate"r fotli'er blowing agents which can be em'ployediri the process'of this invention include methylene chloride, liquified gases which have boiling points below 80 F."andfabov'e +60 F., or other inert gases such as nitrogen, carbon dioxide added as such, methane, helium and argon. Suitable liquefied gases include aliphatic'a'nd cycloalip'hatic fi'uoro carbons which vaporize at'o r below the temp'era tur'e' of the v foaming mass. Such gases are at least'pa'rtially fluo'rin'ate'd and may also be" otherwise halogenated' Fluorocarbon blowing agents suitable for use in foa'rni'ng the formulations of this invention include tri'chlqromonofluoromethane, dichlorodifluorometharie,"1,1 dichloro-l fluoroethane, 1,1;1manure-anaem a,3 aifitibr-4,4;4' rifiuorobutane, hexafluorocyclobutene and oc'tafluorocyclobutane. Another useful class of blowing agents include thermally-unstable compounds which liberate gases upon heating, such as N,N-d imethyl-N,N'-dinitrosoterephthalamide, and the like. The generally preferred'rfiethodbf foaming'for producing flexible foams is the use of water or a combination of water plus a'fiuorocarbon blowing agent suchas trichloromonofiuoromethane.

The amount of blowing agentemployed'in thefo'am ing reaction will vary with factors such as the density that is desired in the foamed product. Usually, however, from about 1 to about 30 parts by weight of the blowing agent per 100 parts by weight of'tlie polyester polyol starting material is preferred. a

The organic flame retardants that can be employed in producing flame-retarded flexible polyester foams in accordance with the teachings of this invention can be chemically combined in one of the other of the materials used (e.g., in the polyester polyol), or can be'discre'te chemical compounds added as such to the foam'formulation. The flame-retardants preferably contain phosphorus or halogen, or both phosphorus 'and halogen. Flame-retardants of the discrete chemical compound variety include: 2,2-di(bromoethyl)-1,3-propariediol; tris (2 chloroethyl)phosphate[(ClCH CH O) P(O) 2,3? dibromopropanol; brominated phthalate ester jdiols' from tetrabromophthalic anhydride and propylene "o oxypropylated phosphoric acid; polyolph'osphite's trisdipropylene glycol)phosphite]; polyol phosphonates' [e.g., bis (dipropylene glycol)hydroxyrriethane phosphonate] tris (2,3-dibromopropyl)phosphate; tris(1,3-dichloropropyl)phosphate; tetrabromobisphenol-A; {tetrabromohthalic anhydride; tetrachlorophthalic anl iyd de; chlorendi'c acid and its anhydride; diallylfch'lorefidate; 2,4,6-tribromophenol; pentabromophenol;. bis(2,3-dibr omopropyl) phosphoric acid or salts thereof; tris( I-bro o: 3-chloroisopropyl)phosphate; brominated anilines and anilines; diethyl-N,N-bis(2 h'ydroxyethyllamind phosphonate; di-poly(oxyethylene)hydroxyriiethyl phonate; 0,0-diethyl-N,N bis(2 -hydroxyefhyl)arn' methyl phosphona'te; di-poly(oxypropylene)phenyl phos; phonate; di-poly(oxypropylene)chloromethyl, phosphonate; di-poly(oxypropylene)butyl phosphonate; and other flame retardants known to the art. The aforesaid geompounds may be used as essentially the sole flame retardant or various combinations thereof may be used Those of the above flame-retardants of 'thediscrete chemical compound variety which contain ..groups eactive with hydroxy or isocyanato groupsfcanbe" ed as reactants in producing the polyester polyols ojcan be reacted with organic polyisocyanates to profducemodified polyols or polyisocyanates having chemically cornbined flame-retardant groups. Such modified polyete'r and polyisocyanates are useful as reactants in the fprdc this invention. In-such cases, due regard must be v to the possible effect of the functionality of the 0mpound on the other properties (e.g., of flexibility resulting foam.

The flame retardant can be used in an'amountfroin 4 about 1 to about 25 parts by weight of the polyester polyoI OtheFaddit'idnal ingredien l can e'er'riplo'y'ed in minor amounts in producing poly hane"foarris' inaccordance with the process of Hi invention,'fif' dejsired, for specific purposes. Thus theafores'aid inhibitors such as Ionol (which can also be addd' as cbmponents'l'of the aqueous premixed solutions of'this invention be added directly to the final foam formulations. Simi ar- 1y, hexylene glycol can be added to the final formulation as a compression set addltivefalthbiighit can also be introduced as a compoh bf'the solution compositions of this inventiorif-"Pa'ra oil can'b'e added to regulate cell structure so as to coarseri'c'ells 'fahdtliereby're'dilice the tendency of the foam to splitzj Other additives that can be employed are dyes or pigm tsaiid'antiyello'wing agents.

The process dsd'r'ibe'd herein; for the flexible polyester urethaiie 'foan'i; can e"d outfin accordance with the prepolymer techniqu c'cordance with which the polyester' p'olyol an i is'gst socyanateare prereacted such that a substantial fam'ount' ofunfreacted isocyanate groups remain. The'res rig jprlepo'ly'rrieris then combined with the foaiibs'tab lzersof this invention, amine catalyst aiiiib'lowiiigagent? Usually, however, the process is carried out as a one-shot processin which thew polyester polyol and. polyisocyanate-zreactants are independently. added to the-'foam-producing reaction mixture. The foamingv and urethane-forming reactions occur without the applicationgofrexternalheat. Often the resulting foam is. cured by heating the foam at a temperature between about C. andiabout C. for about 10 to about /60.minutes to eliminate any surface tackiness, as desired. It is to be-understood that variations in process conditions and manipulative steps can be used as known in the art. For example, the various ingredients of the reaction 'mixture :can be combined *and the foaming reaction mixture ipoured intofa-mold'," or the-various ingredients can be combined and the foaming reaction mixture commenced and completed in a mold.

The relative amounts of the various components reacted iii"accofrdancel witliflthe 'above-des'cribed process fofgp oii'uc hg fl xible polye'ster urethane foams are [not narfowlyj .7

weight per 100 parts by t 1 The relative'fa cunts of these 'two cornpon'rit's 'tlje; mount required 3 to pioaueane urethane structure of tiie foain anu ateswaiveamen s"are well known in the art. The sourceofthe blow'iiig action such as water, aii 'ilii'ry 'blb wirrg ge ts; i'hirie catalyst an ""the orga'nostabilizfs are'each pieseattn a "to-"achieve the function of the t nnis, 1th blowing agefifi's resent m minor aiiib'unt uffieieiit tb foarri theaeadtion mixture;'the"amine catalyst presentfih a ctalytic 'amount(Eel, a'ri'amount suflicient to ca'talyzthe reatiohto produce the urethane at' -a reason'alj e' r ate andithe b'r'gano'silicoji "polymers of this in've "on'are""presii't' in a'foam stabiliiingamount, that'"is, 'ir'i 'ari anio'unt :sufiicie'ntt'o stabilize the foaritj The preferre ameamsee -=various components are as ular weights and the respective known molecular weights of such fluids. In establishing the calibration curve, the .various dimethylsiloxane fluids were in solution in trizchloroethylene solvent. In measuring the molecular \weights of the polymers described herein, the elution -volume observed for any particular polymer product (in trichloroethylene solvent) was equated with the corresponding elution volume of the calibration curve, and

, the molecular weight associated with that particular eluti on volume was assigned as the molecular weight of the polymer product. The use ofGel Permeation Chromatography for measuring molecular weights is discussed in Polymer Fractionation (ed.' Manfred. I. R. Cantow,

Academic Press, Inc., New-York, 1967;), pp. 123-173,

The'allyl end-blocked polyether having an average molecular weight of about 389 and the average composition CH CHCH '(OC H.I) OCH was mixed in an amount of 1200 grams (3.1,rnols) with 600ml. of toluene and 10 parts per million (p.p.m.) of Pt as H PtCl 'in a round-bottom flask equipped with a reflux condenser. stirrer and thermometer. The mixture was heated to 60 C. and while at that temperature, about 3 mols (345.15 grams) of methyldichlorosilane [HSi(CH (CD 1, was added v to the mixture at such a rate to maintain the temperature at about 85 -95 C. After completion of the reaction and removal of toluene solvent by rotary evaporation, 1540 grams of product was provided. Theireaction product has the average formula,

3 2 4 )'1.2 3 e' i( 3)C 2 f (b) Preparation of Surfactant A The iapparatus employed in this: example comprised. a

(g-necked reaction, flask equipped With a. mechanical stirrer, distilling column (vacuum-jacket. strip-silvered;

effective length 60 cm.; Helices packing A inch 1D.) with take-off head-and thermometer. The reaction flask contained a mixture of trimethylchlorosilane (54.25 grams; 0.5 mol), tetraethoxysilane (93.7 grams,'0.45mol), 'CH O(C H -C H Si(CH )Cl (252.0 grams; 0.5 mol) prepared in accordance with paragraph (a) above, and 500 ml. of toluene. Water was added to this mixture inan amountof 59.6 grams (about 100 percent excess overstoichiometry)without applying external heat. The reaction was exothermic. After the completion of water addition, the reaction mixture was allowed to stir for about 2 hours at ambient temperature. After this period of time, the mixture was heated and volatiles (ethanol water-HCl-toluene) were removed (boiling range'7095 C.) followed; by the removal of excess water at 100 C. The reaction mixture was furtherheated to reach the reflux temperature of toluene (100 C. at the head) and was kept at this point for several minutes. The reaction mixture was then cooled, neutralized with sodium bicarbonate and filtered. After further removal of toluene by rotary evaporation at 50 C. and 1 mm. mercury pressure, the reaction product weighed 250 grams (83 weight percent yield,'based on complete hydrolysis). Analysis of the product showed the presence of residual OH and --0C H (0.8 and 1.6 weight percent, respectively). Based the average composition,

26 on the relative molar proportions of reactants employed, the mole ratio (a:b:c) of the i Si04/z:OHaO-(C2H4 )1.2CaHSiOz/2=( HOaSiOm monomeric units in the liquid polymer product (designated'herein as Surfactant A) is 0.9:1:1.

EXAMPLE 2 Preparation of Surfactant B The reaction of this example was carried out in a reaction vessel equipped with a thermometer, condenser with take-off head, and stirrer. The reaction mixture contained 400 ml. of xylene, 0.5 mol of each of trimethylchlorosilane (54.25 grams) and (252.0 grams) prepared as described in accordance with Example 1(a) above, and 0.8 mole of tetraethoxysilane (167.0 grams). While stirring this mixture, water (37.8 grams) was slowly added thereto, followed by stirring of the reaction mixture for 4 hours at ambient temperature.

.After removal of volatiles below 101 C., filtration and solvent removal, 302.0 grams of liquid polymer product .was obtained. The product has a molecular weight of about 4300 (G.P.C.) and residual OH and OC H contents of 1.2 and 2.1 weight percent, respectively. Based on the relative molar proportions of reactants, the mole ratio (azbzc) of the 5104/22CHsO-(CzH40)1J- aHr-Eii0m2(CHtOsSiOm units in the liquid polymer product (designated herein as Surfactant B) is 1.6:121.

The following Examples 39 illustrate the preparation of polymers containing SiO (llHa CflH5CH20(C2H4 )MCl t-SlO2l2 and (OH SiO units, designated herein as Surfactants C through H and J, respectivelyrln the preparation of these surfactants, the polyether-substituted methyldichlorosilane reactants were producedin accordanceewith the procedure typically illustrated :by- Example 3(a) below using substantially the same allyl end-blocked polyether starting material.

. 7 EXAMPLE 3 (a) Preparation of '.I'i. H2 2H. 6... :.1H..si(crawl.v Following the procedure of Example 1(a) above, 438 grams (1 mole) of the allyl end-blocked, benzyl-capped polyether having a molecular weight of about 438 and (capping about percent) was reacted in 200m'l"."- of toluene solvent with methyldichlorosilane' gramsr-l mole) in the presence of'l0 p.p'.m. of Pt'as H PtCI Removal of toluene solvent provided'550 grams tion product having the composition,

G 5 2 2 4 6.6 3H5 C 3) 2 1 Y (b) Preparation of Surfactant C of addi- The reaction of this example was carired out in essentially the same manner as in Example 2 except that: the reaction mixture contained 200 ml. of xylene and 0.25 mol of each of trimethylchlorosilane (27.12 grams),

(138.8 grams) prepared in accordance with Example 3(a) and tetraethoxysilane (52 grams); and the amount of water added thereto was 38 grams. Analysis of the liquid product (148 grams) showed the presence of residual OH and OC H contents of 1.1 and 0.25 weight percent, respectively. Based on the relative molar proportions of reactants employed, the mole ratio (azbzc) of the product, was 3900. Based on the relative molar proportions of reactants employed, the SiO CH; cantonrootnmw-otm-iitom CH 6 and (CH SiO monomeric units are present inthe 3 liquid polymer product (designated herem as Surfactant SiOm;CnH OHgO(CzH40)e,uOaH5S102 2:(CHa)aSl0l/ H) and equimolar proportions (that is, the a:b:c ratio is units in the polymer product (designated herein as Surbo t 1;1;1) factant C) is 1:1:1. 10 EXAMPLE 9 EXAMPLES 4-7 Preparation of Surfactant J v In accordance With files? P additional The reaction of this example was carried out in es- P y were p lf deslgnated herem as Surfactants sentially the same manner as in Example 8 above, except F and 115mg thefeactants and amounts thel'fiof that: the reaction mixture contained 300 ml. of xylene, s Set-forth in the fOUOWlHg Table In Examples 6 0.5 mol of each of trimethylchlorosilane (54.25 grams) and 7, 200 m1. of xylene was used as solvent, the reaction and C6H5CH2O (C2H4O) Q H Si(CH )C1 755 mixture of Example 5 containing 400 Of y The grams), and 0.45 mol of tetraethoxysilane (93.7 grams); respective procedures were essentially as described under and the amount of water added thereto was 59.5 grams Example 2 above. The relative proportions of the mono- (100 percent excess over stoichiometry). Analysis of the meric units contained in the respective liquid polymer product (285.5 grams) showed the presence of residual products are expressed in Table I by the ratio, a:b:c. -OH and OC H in amounts of 1.2 and 0.1, respec- TABLE I Example Surfactant D E F G Reactants:

snoonnh:

Grams 52. 0 167 31. 23 52. 0 M515 0. 25 0. s 0. 15 0. 25

t lsC 2O(CzH1O)t.oCaHa-Si012:

Grams 138.8 277.0 133.3 138.8 Mols 0.25 0.5 0.25 0.25 (CH3)3SIC11 Grams 27.12 54. 25 27.12 43.35 Mols 0. 25 o. 5 0.25 0. 4 Water, grams (ml.) 38 40. 0 (40) (40) Polymer product:

Weight, grams 149 308 140 152 Residual-OH,weight percent. 1.5 0.9 1.25 1.17 Residual-0 C2115, weight perce 3. 5 3.0 0. 14 O. 14 Molecular weight (G.P.G.) 4, 100 6, 000 3, 300 Mole ratio ofunits, azbw 1:1:1 1.6:l:1 0.6:1:1 1:1:16

I 1 Designates the mole ratio of 8104 CeH CHzO(C2H4O)6.b-CaH5SiO2/z: (CHmSiOm,

respectively based on the relative molar proportions of reactants.

' EXAMPLE 8 Preparation of Surfactant H The reaction of this example was carried out in a reaction vessel equipped with a thermometer, condenser with take-01f head, and stirrer. The reaction mixture contained 3000 ml. of xylene, and about 4 moles of each of trimethylchlorosilane (432 grams),

(2212 grams) and tetraethoxysilane (832 grams). While stirring this mixture, water was slowly added thereto in an amount of 324 grams. After the water addition was completed, the reaction mixture was stirred at ambient temperature for several hours. The mixture was stirred at ambient temperature for several hours. The mixture was then heated and volatiles (ethanol-water-HCl-xylene) were removed (boiling range of 70-95 (3.). The reaction mixture was then cooled, neutralized with sodium bicarbonate and filtered. Removal of xylene by rotary evaporation afforded the product (2460 grams). Analysis of the product showed a silicon content of 11.0 weight percent (calculated Si=l3.l%) and the presence of residual OH and OC H contents of 1.2 and 0.2 weight percent, respectively. The molcular weight (G.P.C.) of the tively. Based on the relative proportions of mole ratio of units in theliquid polymer product (designated herein as Surfactant] is 0.9:1:1.

EXAMPLES 10-13 I Preparation of Surfactants K, L, M and N In accordance with these examples, four additional polymers of this invention, designated herein as Surfactants K, L, M and N, were prepared using the'reactants and amounts thereof as set forth in the following Table II. The cohydrolysis-cocondensation reaction of Example 10 was carried out in toluene solvent in substantially the same manner described for Example 1(b). The reactions of Examples 11-13 were carried out in xylene. The clear liquid polymer product of Example 10 (Surfactant K), was found to contain 11.1 weight percent silicon and 0.4 weight percent residual toluene, and has a viscosity of 271 centistokes at 25 C. The respective molecular weights (G.P.C.)', residual silicon-bonded hydroxyl and ethoxy contents and the relative molar proportions (expressed as the a:b :0 ratio) of the monomeric units contained in Surreactants, the

factants K through N are indicated in the following Table II.

TABLE II I 30 The runs of Examples 16-30 were carried out in accordance with substantially the same general procedure Example Surfactant. K L M N Reactants, parts by weight:

Si 2H5 4- 452 103. 1 26. 26. 0 CuHsCHzO-(CzH40) -CaHe-S1(CH3) C12 1, 600 153. 9 47. 0 139. 7 Average value of d 8. 5 8. 1 8. 1 8. 1 (CHa)aSiCl 274 26. 9 13. 6 6. 8 Water 285 27 6. 6 7. 8 Polymer product:

ResidualOH' 0. 9 1. 4 1. 2 2. 0 Residual-0 C1Hs 0. 1 2. 4 0. 2 0. 5 Molecular weight (G.P. 4,100 3, 500 2, 400 3, 000 Mole ratio ofunits,a:b:c 0.9:1:l 2:1:1 1.6:1:1.6- 0.6:1:0.3

l 1 Designates the mole ratio of S104 CoH5CHz0-(CzH4O)d-C:HaSiO2/z on the relative molar proportions of raeetants. EXAMPLE 14 Preparation of Surfactant O In accordance with this example, 30 grams of Surfactant D identified in Table I above, was dissolved in 80 ml. of toluene in a nitrogen atmosphere. To this mixtur e, 0.3 gram of N-ethylmorpholine was added, followed by rotary evaporation. The liquid product (designated :(CH;);SiO z, respectively, based which entailed the following steps. The surfactant, amine catalysts and water were premixed in a 50 milliliter beaker. The polyester polyol reactant was weighed into a tared 32-ounce capacity container. The flame-retardant [tris(2-chloroethyl)phosphate] and tolylene diisocyanate reactant were also weighed into the container and mixed with a spatula until homogeneous. Further mixing was done on a drill press equipped with a double three-bladed marine-type propellor about three inches in diameter. The

herein as Surfactant 0) had a molecular weight (G.P.C.)

of 7100 and, upon analysis, was found to contain 10.3 weight percent silicon (calculated Si=l3.1 weight percent) and residual OH and OC H contents of about 1 and 0.2 weight percent, respectively.

EXAMPLE .15

Preparation of Surfactant P ignated herein as Surfactant P .had a. molecular weight (G.P.C.) of 7200 and, upon analysis, was found to contain 0.7 and 1.1 weight percent of residual -,OH and" OC H groups, respectively.

In the following Examples l6-30, foams were produced using the above-described Surfactants A through H and I through P of the present invention as the respective foam-stabilizing surfactant component of the foam-producing reaction mixture, designated herein as Foam Formulation A, which had the following composition:

TABLE I i-FOAM FORMULATION A Component: Parts by weight Surfactant Varied (0.35, 0.5 and. l).

Polyester polyol- 100.0. N-ethylmorpholine 1.9.

- Hexadecyldimethylarnine 0.3. Water .3.6. Tolylene diisocyanate (Index 105) 2 45.2. Tris(2 chloroethyl)phosphate 7 0 The polyester polyol employed was a commercially available polyester resin produced from adipic acid, diethylene glycol and trimethylol propane in a mole ratio of approximately 1 1 0.2. This polyester has a hydroxyl number of about to 56, a molecular weight of about 2.000, an acid number not greater than 2 and a viscosity of about 17,000 centistokes at about 25 C. This particular polyester is sold under the name Witco Fomrez No. 50.

2 This component was a mixture of 2,4-tolylene diisocya-nate (80 weight percent) and 2,6-tolylene diisocyanate. Index 105 means that the amount of mixture employed was 105 percent of the stoichiometric amount required to react withthc polyester polyoland water present in the foam formulation.

mixing in the drill press was accomplished at 1000 revolutions per minute for eight seconds. Then the premixture of surfactant, catalyst and water was added and mixing was continued for seven additional seconds. The reaction mixture was poured into a 12 in. x 12 in. x 12 in. cardboard box, was allowed to rise and was then cured for about 30 minutes at 130 C. In most instances, samples were prepared for breathability measurements and for a determination of burning resistance (burning extent and flame rating) in accordance with ASTM 1692-59T.

The following terms are used to describe the quality of the foams produced in the examples: Rise denotes the foam height and is directly proportional to potency of the surfactant.

Breathability ,denotes the porosity of a foam being roughly proportional to thel'nurnber' of open cellsfin afoam, and was measured in"accordance with the NOPQO breathabfility test procedure described by RYE. Jones'and G. Fesrnan, Journal of, Cellular Plastics, flanuary 1965. In accordance withthis 'test, breathabili tyis measured as follows: A 2 inch x 2 inch x 1 inch piece of foamv is cut from near the center of-the:bun.*=Using a NOPCO Foam Breathability Tester, Type G.P.-2 Model 40 6D. 10, air is drawn through the one inch portion EXAMPLES 16-17 The surfactants employed in these examples were the above-described Surfactants A and B in which the respective mole ratios of the SiO 011.0 (oznimm-cznrsrofl.

and (CH SiO units are 0.9:1:l and 1.6:lz1, respectively. The breathability and burning extent of foams produced using these polymers in Foam Formulation A of Table III above, were measured at three different polymer in equialso indicates the residual hydroxyl and ethoxy contents of each surfactant.

.32 G, H, J and K in which the respective mole ratios (azbzc) EXAMPLES 27- -28 C6H6CH2 (C1 A )LI-CJh-iOfll of monomeric units are Within the preferred range expressed herein, that is, about 0.6l.8:1:0.81.8 and the ratio ofa+'c:b is 1.4-2.8:1; As shown by-the data of Table V, these preferred surfactants provided more open foams than Surfactants L, M and N, as indicated by the breathability measurements.

The surfactants employed in these examples were Surfactant D (prepared as described in Example4) in which the SlO z, v

and (CH SiO monomeric units were present molar proportions, and Surfactant 0 which is the polymer product obtained by treatment of Surfactant D with methyl isocyanate as described in Example 14.The breathability' and burning extent of foams produced using these polymers as the foam stabilizing surfactant of Foam Formulation A of Table III above, were measured at three different polymer concentrations. The amount of surfactant employed and the results are given in Table VI which Flame (inches) rating Example number H and J 20 TABLE V surfactants containing SiO I lH6 2 2H4o)d-C3HesiO2/: and (CHmSiOm units in a mole ratio of aabzc, respectively, as defined below Foam properties in foam Breath- Burning Formula- Rise ability extent tion A (inches) (s.c.f.m.)

TABLE IV -1, 2 and -3) which were car- Surfactant Parts bywt.

azbzc EXAMPLES 18-26 In these examples, Surfactants, C, F, G,

inches- Designatron 3'5 tent,

respectively, were employed as the surfactant compo- -described general procedure. The mole ratio t 11L2 2 2 2 aaaaaaaa ar w g v 1.1. 111 1 T TTT 78877767798888988964781 4667 555am5nmnm5iii miidemzmizmiinmiemiifi 550550550550550550 0 L nr ar dr dr ain m mm mm 0 Q 0 0 0 0 Q Q concentrations. The amount of surfactant employed and the results areas follows:

of this invention have a good combination of potency and processing latitude as stabilizers of flexible polyester foam 15 and, in addition, possess the further desirable property of allowing for the formation of self-extinguishing flameretarded foams.

through N of the above Examples 3, 6, 7, 8 and 9 through nent of Foam Formulation A of the above Table III. Each of the respective examples includes three foaming reactions (indicated as ried out at different concentrations of surfactants using the above (azbzc) of the monomeric units present in these surfactants, the concentration thereof and the results are given in the following Table V.

The results of Table IV indicate that Surfactants A and B Partsbywt Rise,inches Breathabilit Burningex Flame rating.

Stabilization of flexible polyester foaming using Example Number 7 Example number Tania vr inehes..

Surfactant.

0 CZHB, wt. percent- Parts by wt Rise, inches... vBreathability,

Burning extent 2 2 3 Average value of d in polyether chain is 8:1: 4 Coarse.

ge value of d in polyether'e'hain The results of Table v indicate that Surfactants c, F, G, H and J through N of this invention were effective stabilizers of flexible polyester urethane foam as indicated Average value of d in polyether chain is 2 Avera by foam rise. Although Surfactants L, M and N had overall good potency as stabilizers and provided useful foams, the foamed products produced therewith tended to be tight indicating close celled foams, or-coarse indicating foams having fewer cells (about'25 or less) per linear inch. Of these various surfactants, the best overall combination of properties was exhibitedby Surfactants C, F,

33 EXAMPLES 29-30 The surfactants employed in these examples were Surfactant E (prepared as described in Example 5) in which the SiO4 3,

and (CH SiO monomeric units were present in a mole ratio of 1.6:1:1, respectively, and Surfactant P which is the polymer product obtained by treatment of Surfactant E with methyl isocyanate as described in Example 15. The breathability and burning extent of foams produced using these polymers as the surfactant of Foam Formulation A of Table III above, were measured at three different polymer concentrations. The amount of surfactant employed and the results are given in Table VII which also indicates the residual hydroxyl and ethoxy contents of each surfactant.

TABLE VII Example number burtactant-.--; E P

-OH, wt. percent-.- .9 0.9 0. 9 0.7 0.7 0.7 CzH5, Wt. percent .0 3. 0 3.0 1. 1 1. 1 1. 1 Parts by wt 35 0. 50 1. 0 0. 35 0. 1.0 Rise, inches 5. 8 5. 8 5. 7 5. 7 5. 8 5. 7 Breathability, s.c.f.rn. 1. 5 1. 2 1. 5 2. 6 2. 8 3. 5 Burning extent, inches-.. 1. 3 1. 8 l. 9 1. 3 1. 4 1. 5 Flame rating Selfxtinguishing The data of Tables VI and VII show that in each instance Surfactants D and E and their respective methyl isocyanate derivatives were potent stabilizers of flexible polyester foam and provided good quality selfextinguishing foam. The data also show that the treatment of Surfactants D and E with methyl isocyanate substantially reduced the total content of residual hydroxyl and ethoxy groups, and that the methyl isocyanate derivatives provided more open foams as evidenced by increased breathability, without sacrifice of low burning extent.

EXAMPLES 31-37 In these examples, a potency determination was made of surfactants of this invention using a foam formulation, designated as Foam Formulation B, which contained 5 parts by weight of water per 100 parts by weight of polyester polyol reactant. The 5 parts water system is usually more diflicult to stabilize than the more conventional formulations containing less water and thus provides a relatively sensitive test of potency. The composition of Foam Formulation B is as follows:

34 TABLE VIIL-FOAM FORMULATION B Component: Parts by weight Surfactant Varied (0.35 and 1). Polyester polyol 100.0. N-ethylmorpholine 1.9. Hexadecyldimethylarnine 0.3.

Water 5.0. Tolylene diisocyanate (Index 1 The polyol employed was the same as that of Foam Formulation A and is identified in footnote 1 'of Table III.

The isocyanate employed was the same as that of Foam Formulation A and is identified in footnote 2 of Table III.

Each of Examples 31-37 includes two foaming reactions (indicated as -1 and -2) which were carried out at different concentrations of surfactants using the general procedure described above with reference to Examples l'6-30. The mole ratio (a:b:c) of the monomeric units of Surfactants B, D-G, J and K employed in these examples and the results are given in the following Table IX.

TABLE IX Stabilization oi flexible polyester foam using surfactants containing Slot/2, RO(C9H 40)d-C3Hs-S10a/a and (CH SiOr/1 units in 8 mole ratio of azbzc respectively, wherein R is methyl (Surfactant B) or benzyl (Surfactants D-G, J and K), and azbw is defined below Parts by wt. in foam Surfac- Formula- R e Cell Example tant a:b;c tion B (inches) structure E 1. 6:1:1 0. 35 9. 1 Excellent. E 1. 6:1:1 1 9. 1 Do. B 1.6:1:1 0. 35 9.2 Do. B 1. 611:1 1 9. 3 Do. D 1:1:1 0.35 9.1 Do. D 1:1:1 1 9. 1 Do. G 1: 1:1. 6 0. 35 9. 0 Good. G 1:l:l.6 .1 9.0 Do. I 0. 9:1:1 0. 35 9. 3 Excellent. I 0. 9:1:1 1 9. 4 Do. K 0.9:111 0.35 9.3 Do. K 0. 9:1:1 1 9. 4 Do. F 0. 6:1:1 0. 35 8. 7 Coarse F 0. 6:111 1 8. 9 Do.

The results of Table IX show that Surfactants B, D-G, J and K of this invention provide foams of excellent rise even at the relatively low concentration of 0.35 part by weight per parts of polyester polyol reactant, and have good processing latitude.

EXAMPLES 38-44 In accordance with these examples, Surfactant H and Surfactant K were blended with various organic compounds to provide illustrative solution compositions of this invention. These blended compositions are designated herein as Surfactants Q through W and each was used as the surfactant component of Foam Formulation A of Table III above in a concentration of 1 part by weight, following the general procedure described above with reference to Examples 16-30. In using the blended surfactants, clear, homogeneous aqueous premixtures were obtained when the water and amine catalysts of Foam Formulation A were combined therewith. The composition of the blended surfactants and the results of these examples are given in the following Table X.

TABLE X Foam properties Blended surfactant Breath- Burning Wt. percent of Rise ability extent Flame compouents (inches) (s.c.i.m.) (inches) rating 54.0 23.0 5.8 2.2 1.4 SE 23.0 338 383 210ml 5.9 2.7 1.5 SE 13.3 (13.5) 50 12.5 5.8 2.6 1.6 SE Hexylene glycol. 37. 5

TABLE XCon.tinued Foam properties Blanded surfactant Breath- Burning Example Wt. percent of Rise ability extent Flame number Number Components components 1 (inches) (s.c.i.m.) (inches) rating Surfactant K... 60. 42 U Tall oil 15. 0 5. 8 2. 6 1. 4 SE Organic non ionic surfactant 35. 0 Surfactant K 50. 0 43 V Tall oil 15.0 5 8 2.4 1.5 SE

Organic non ionic Surfactant 35. 0 Surfactant K 52.0 Tall oil 15. 6 44 W Hexylene glyco 21.0 5.8 2.4 1.5 SE

Organic non ionic surfactant 10. 4 Ionol i 1. 0

1 Figures in parentheses are normalized on the basis of 100 percent. Diethylamme salt of Onalkylated aromatic sulfonic acid.

5 2,6-di-tertiary-butyl-p-cresol.

The results of Table X demonstrate that the solution compositions of the organosilicone polymers of this invention also possess good potency as stabilizers of flexible polyester foam and allow for the formation of selfextinguishing foams.

A blended surfactant composition, designated herein as Surfactant I, comprising a polyoxyalkylenepolysiloxane block copolymer in combination with an anionic organic surfactant, was also tested under the conditions employed in the examples of Table X. In this test, Surfactant I which is not a composition of the present invention, was used as the surfactant component of Foam Formulation A in a concentration of 1 part by weight per 100 parts of the polyester polyol reactant, following substantially the same general procedure described above with reference to Examples 16-30. The composition of Surfactant I which is used commercially for the manufacture of flexible polyester urethane foam, and the results obtained therewith are given in Table XI (wherein Me designates a methyl group).

Typical analysis (weight percent) 62.0 sodium sulfonate, 32.7 mineral 01], 4.5 water, 0.7 inorganic salt; average molecular weight (of sulfonate portion) is 435; flashpoint (3.0.0., 400 F.; sold commercially under the name Bryton 430.

2500 parts per million parts of components (a) to (d).

The results of Tables X and XI show that, whereas the foams produced using the solution compositions of this invention (Surfactants Q through W) had burning extents sufliciently low to be rated as self-extinguishing, the foam produced using Surfactant I did not qualify as self-extinguishing.

In the runs summarized in the following Table XII, other polymers, designated herein as Polymers II, III and IV, which are not within the scope of the present invention, were used as the surfactant component of Foam Formulation A of Table III above. These polymers are identified as follows:

Polymer II contains SiO units and the two types of monofunctional units, (CH SiO and in a mole ratio of 1.6:1:1, respectively; the mole ratio of SiO total monofunctional units, normalized on the basis of one mole of SiO is 1:1.25.

Polymer IH contains SiO and (CH SiO units in a mole ratio of 1:1 and was used as a 50 weight percent solution in xylene.

Polymer IV is a commercially available product designed for use in the manufacture of polyvinyl chloride foams. It is supplied in about a 50 weight percent solution in xylene having a viscosity of 6 centistokes at 77 F. and a specific gravity of 1.00 at 77 F. On the basis of analytical data, it is believed that this polymer contains Slo and (CH SiO units in a mole ratio of 1:0.8, respectively. The runs of Table XII were carried-out following the general procedure described above with spe- Results cific reference to Examples 16-30 and include control Rise, inches 53 runs based on the use of the above-described Surfactant B th bilit ,f 25 K of this invention. The concentration of Surfactant K Burning extent, inches 5.0 and of Polymers II, III and IV employed in each run is Flame rating Burns also given in Table XII.

TABLE xII Parts by weight in Breathfoam For- Rise ability Run Surfactant mulationA (inches) (s.c.f.m.) Remarks Controll K 0.35 2.1 Excellent foam. 1 PolymerII L- 0.35 Shrunk--.-- None Severe shrinkage. Control 1 1 5.9 3.6 Excellent cell structure. 2 Polymer III". 1 Boiled 3 PolymerIV 1 Collapsed 2 SiOm: [HO-(OzH4O)1.sC3Ho- 3 Not a polymer of this invention. 4 t/2: (CHa)aSiOr/2=1:l; emp

SKCHI) 201 (CH3)3SIOil2]=1Z1.25.

loyed as 50 weight percent solution in xylene.

The results of Table XII show that whereas Surfactant K of this invention provided excellent flexible polyester foam, Polymers II, III and IV failed to perform as effective stabilizers.

What is claimed is:

1. A fluid siloxane-oxyalkylene polymer consisting essentially of: (A) inorganic tetrafunctional silicon-containing units in which the four valences of the respective silicon atoms are satisfied by bonds to oxygen, (B) polyfunctional silicon-containing units in which from two to three valences of the respective silicon atoms are satisfied by bonds to oxygen and at least one valence is satisfied by a bond to a carbon atom of a bivalent hydrocarbon radical having from 2 to 14 carbon atoms, the second valence of said bivalent hydrocarbon radical being satisfied by a bond to oxygen of a poly(oxyalkylene) chain which is terminated by an organic radical selected from the group consisting of RO, RNHC(O)O- and RC(O)O where R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, and (C) monofunctional silicon-containing units in which one valence of the respective silicon atoms is satisfied by a bond to oxygen and the remaining three valences are satisfied by respective bonds to an organic radical selected from the group consisting of a monovalent hydrocarbon radical having from 1 to 12 carbon atoms per radical and a bivalent hydrocarbon radical having from 2 to 14 carbon atoms, the second valence of said bivalent hydrocarbon radical being satisfied by a bond to oxygen of a poly- (oxyalkylene) chain which is terminated by an organic radical selected from the group consisting of RO, RNHC(O)O-- and RC(O)O-- where R is as aforesaid, and wherein the mole ratio of the tetrafunctional to said polyfunctional units ranges from about 0.4:1 to about 2:1, and the mole ratio of said monofunctional to said polyfunctional units ranges from about 0.221 to about 2:1.

2. A liquid siloxane-oxyalkylene polymer which consists essentially of monomeric units (A), (B) and (C) wherein (A) is SiO (B) has the unit formula:

wherein E is a po1y(oxyalkylene) chain an oxygen atom of which is linked to silicon through a bivalent hydrocarbon radical having from 2 to 14 carbon atoms, said chain being terminated by an organic radical selected from the group consisting of R RNHC(O)O and R C(O)O- where R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, R is a monovalent hydrocarbon group having from 1 to 12 carbon atoms, e is an integer having a value of from 1 to 2 and f has a value of zero to 1, provided the sum e+f is from 1 to 2, and (C) is a triorganosiloxy unit, the mole ratio of the aforesaide (A) units to said (B) units being from about 0.421 to about 2: 1, and the mole ratio of the aforesaid (C) units to said (B) units being from about 0.2:1 to about 2:1. 1

3. The polymer of claim 2 in which the (B) units consist essentially of those in which each of e and f of the said formula thereof has a value of one.

4. The polymer of claim 2 in which the (B) units consist essentially of those in which e of the said formula thereof has a value of one and the sum e+f is one.

5. The polymer of claim 2 in which the (B) units consist essentially of those in which e of the said formula thereof has a value of 2.

6. The polymer of claim 2 having a combination of reoccurring (B) units in which each of e and f of the said formula thereof has a value of one, and reoccurring (B) units in which ,1 is zero.

38 7. The polymer of claim 2 in which (C) has the unit formula,

wherein R is a monovalent hydrocarbon group having from 1 to 12 carbon atoms, E is a poly(oxyalkylene) chain an oxygen atom of which is linked to silicon through a bivalent hydrocarbon radical having from 2 to 14 carbon atoms, said chain being terminated by an organic radical selected from the group consisting of RO, RNHC(O)O- and RC(O)O- where R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, and each of g and h has avalue of zero to three, provided the sum g+h is 3.

8. The polymer of claim 7 in which the (C) units consist essentially of those wherein h of said formula thereof has a value of three.

9. The polymer of claim 7 in which the (C) units consist essentially of those wherein g of the said formula thereof has a value of one and h has a value of two.

10. The polymer of claim 7 having a combination of reoccurring (C) units in which h of said formula thereof has a value of three and reoccurring (C) units wherein h of said formula thereof has a value of two and g has a value of one.

11. A liquid siloxane-oxyalkylene polymer which consists essentially of: (A) SiO units; (B) polyfunctional siloxy units having the formula,

wherein R is a monovalent hydrocarbon group having from 1 to 12 carbon atoms, d has an average value of from about 4 to about 30, n has a value of from 2 to 4, provided at least 75 percent by weight of the poly(oxyalkylene) chain, (C H O) is constituted of oxyethylene units, L is a bivalent hydrocarbon radical, W is a monovalent organic radical selected from the group consisting of R, RNHC(O)- and RC(O)- where R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, 2 has a value of from 1 to 2 and f is from 0 to 1, provided the sum e-l-f is from 1 to 2; and (C) monofunctional siloxy units having the general formula,

wherein d, n C H O) L, and W are as aforesaid, R is a monovalent hydrocarbon group having from 1 to 12 carbon atoms, and each of g and h has a value of from zero to 3, provided the sum g+h is 3; and wherein the mole ratio of said SiO units to said polyfunctional units is from about 0.421 to about 2:1 and the mole ratio of said monofunctional to said polyfunctional units is from about 0.2:1 to about 2:1.

12. A polymer as defined in claim 13 which additionally contains silicon-bonded ethoxy groups.

13. A liquid siloxane-oxyalkylene polymer which comprises monomeric units (A), (B) and (C) as the principal silicon-containing units where: (A) is SiO (B) is a difunctional siloxy unit having the formula,

wherein d has an average value of from about 5 to about 15, n has a value of from 2 to 4, provided at least 75 percent by weight of the poly(oxyalkylene) chain, (C H O) is constituted of oxyethylene units, m has a value of from 2 to 4 and R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms; and (C) is the monofunctional siloxy unit, (CH SiO and 39 wherein the mole ratio of the SiO units to said difunctional units is from about 0.4:1 to about 2:1, and the mole ratio of said monofunctional units to said difunctional units is from about 0.2:1 to about 2:1.

14. The polymer of claim 11 in which W of said polyfunctional siloxy units is said monovalent hydrocarbon radical, R.

15. The polymer of claim 14 in which R is a lower alkyl radical.

16. The polymer of claim 15 in which said lower alkyl radical is a methyl group.

17. The polymer of claim 14 in which R is an aryl group.

18. The polymer of claim 17 in which said aryl group is a phenyl group.

19. The polymer of claim 14 in which R is an aralkyl group.

20. The polymer of claim 19 in which said aralkyl group is a benzyl group.

21. The polymer of claim 11 in which W of said polyfunctional siloxy units is said RC(O) group.

22. The polymer of claim 21 in which R of said R C(O)-- group is a methyl group.

23. The polymer of claim 11 in which W of said polyfunctional siloxy units is said R NHC(O) group.

24. The polymer of claim 23 in which R of said R NHC(O)- group is a methyl group.

25. The polymer of claim 11 in which -L is a bivalent alkylene group.

26. A fluid siloxane-oxyalkylene polymer which comprises monomeric units (A), (B) and (C) as the principal monomeric units where (A) is SiO (B) is a difunctional unit having the formula,

wherein R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, 11 has an average value of from about to about 15, n has a value of from 2 to 4 provided at least 75 percent by weight of the poly(oxyalkylene) chain, (C,,H 0) is constituted of oxyethylene units, m has a value of from 2 to 4, and W is a monovalent organic radical selected from the group consisting of R RC(O) and RNI-IC(O) where R is a hydrocarbon radical having from 1 to 12 carbon atoms; and (C) is a monofunctional unit having the formula, R' 'SiO wherein R is a monovalent hydrocarbon radical having from 1 to 12 carbon atoms; and wherein there are from about 0.4 to about 2 moles of SiO units per mole of said difunctional units (B), and from about 0.2 to about 2 moles of said monofunctional units (C) per mole of difunctional units (B).

27. The polymer of claim 26 wherein said monovalent hydrocarbon groups, R and R, are lower alkyl groups.

28. The polymer of claim 13 in which R is a lower alkyl radical.

29. The polymer of claim 28 in which R is a methyl group.

30. The polymer of claim 13 in which R comprises an aryl radical.

31. The polymer of claim 30 in which R is a benzyl group.

32. The polymer of claim 13 wherein the mole ratio of the SiO units to said difunctional units is from about 0.6:1 to about 1.8:1, the mole ratio of the said monofunctional units to said difunctional units is from about 0.8:1 to about 1.8 l, and the mole ratio of the total SiO plus rnonofunctional units to said difunctiontal units is less than 3: 1.

33. A process for the production of fluid siloxane-oxyalklyene polymers containing monomeric units (A), (B) and (C) wherein (A) is SiO' (B) has the unit formula,

and (C) has the unit formula,

wherein each of E and E of the said respective formulas represents an organic capped poly(oxyalkylene) chain linked to the respective silicon atoms by a bivalent alkylene radical, each of R and R of said respective formulas represents a monovalent hydrocarbon radical having from 1 to 12 carbon atoms, e of said (B) unit is an integer having a value of from 1 to 2 and f is zero or 1, provided the sum e+f is from 1 to 2, and each of g and h of said (C) unit has a value of from O to 3, provided the sum g+h is 3, which process comprises:

(I) cohydrolyzing in an aqueous reaction mixture, re-

actants (A), (B') and (C), where reactant (A) is a silicon-containing compound having four hydrolyzable groups bonded to silicon; reactant (B') is a silicon-containing compound represented by the formula,

wherein E is a member of the group consisting of hydrogen and the aforesaid E groups of monomeric unit (B), and R, e, f and e+f have the same significance defined hereinabove, X is halogen and Y is a hydrocarbon radical, each of s, t and it has a value of from 0 to 3, provided their sum is from 2 to 3 and the sum e+f+s+t+u is four; and reactant (C) is a silicon-containing compound represented by the formula,

wherein E" is a member of the group consisting of hydrogen and the aforesaid E group of monomeric unit (C) and R, g, h and g-l-h have the same significance defined hereinabove and Z is a hydrolyzable group, the aforesaid aqueous reaction mixture containing from about 0.4 to about 2 moles of said reactant (A) per mole of reactant (B') and from about 0.2 to about 2 moles of said reactant (C) per mole of reactant (B');

(II) cocondensing the hydrolyzate from the aforesaid cohydrolysis reaction, thereby providing the aforesaid polymer containing the (A), (B) and (C) units when E of the (B') reactant and E" of the (C) reactant are the aforesaid E and E groups, respectively, and

(III) when E" of the (B') reactant and E" of the (C) reactant are hydrogen, reacting the product of the aforesaid cocondensation reaction with an organic compound bearing a poly(oxylakylene) chain which is terminated at one end by a monovalent olefinic group,

, in the presence of a platinum catalyst, thereby replacing the respective silicon-bonded hydrogen atoms with the said E groups of the (B) units and the said E 

